Posso colocar 2 .htaccess em 1 site

Question

Oi eu tenho um site html simples, vamos dizer a.com com o htaccess como este

RewriteEngine on
RewriteCond %{HTTP_HOST} !^www.a.com$ [NC]
RewriteRule ^(.*)$ http://www.a.com/$1 [L,R=301]

SetEnvIfNoCase User-Agent "^libwww-perl*" block_bad_bots
Deny from env=block_bad_bots


## EXPIRES CACHING ##
<IfModule mod_expires.c>
ExpiresActive On
ExpiresByType image/jpg "access 1 month"
ExpiresByType image/jpeg "access 1 month"
ExpiresByType image/gif "access 1 month"
ExpiresByType image/png "access 1 month"
ExpiresByType text/css "access 1 week"
ExpiresByType text/html "access 1 week"
ExpiresByType application/pdf "access 1 month"
ExpiresByType text/x-javascript "access 1 week"
ExpiresByType application/x-shockwave-flash "access 1 week"
ExpiresByType image/x-icon "access 1 week"
ExpiresDefault "access 1 week"
</IfModule>
## EXPIRES CACHING ##

e eu criei o servidor owncloud em a.com/owncloud com o arquivo .htaccess como este.

<IfModule mod_headers.c>
<IfModule mod_setenvif.c>
<IfModule mod_fcgid.c>
   SetEnvIfNoCase ^Authorization$ "(.+)" XAUTHORIZATION=$1
   RequestHeader set XAuthorization %{XAUTHORIZATION}e env=XAUTHORIZATION
</IfModule>
<IfModule mod_lsapi.c>
  SetEnvIfNoCase ^Authorization$ "(.+)" XAUTHORIZATION=$1
  RequestHeader set XAuthorization %{XAUTHORIZATION}e env=XAUTHORIZATION
</IfModule>
<IfModule mod_proxy_fcgi.c>
   SetEnvIfNoCase Authorization "(.+)" HTTP_AUTHORIZATION=$1
</IfModule>
</IfModule>

<IfModule mod_env.c>
# Add security and privacy related headers
Header set X-Content-Type-Options "nosniff"
Header set X-XSS-Protection "1; mode=block"
Header set X-Robots-Tag "none"
Header set X-Frame-Options "SAMEORIGIN"
Header set X-Download-Options "noopen"
Header set X-Permitted-Cross-Domain-Policies "none"
SetEnv modHeadersAvailable true
</IfModule>

# Let browsers cache CSS, JS files for half a year
<FilesMatch "\.(css|js)$">
 Header set Cache-Control "max-age=15778463"
</FilesMatch>

# Let browsers cache WOFF files for a week
<FilesMatch "\.woff$">
Header set Cache-Control "max-age=604800"
</FilesMatch>
</IfModule>

<IfModule mod_php5.c>
php_value always_populate_raw_post_data -1
php_value upload_max_filesize 513M
php_value post_max_size 513M
php_value memory_limit 512M
php_value mbstring.func_overload 0
php_value default_charset 'UTF-8'
php_value output_buffering 0
<IfModule mod_env.c>
  SetEnv htaccessWorking true
</IfModule>
<IfModule mod_php7.c>
php_value upload_max_filesize 513M
php_value post_max_size 513M
php_value memory_limit 512M
php_value mbstring.func_overload 0
php_value default_charset 'UTF-8'
php_value output_buffering 0
<IfModule mod_env.c>
  SetEnv htaccessWorking true
</IfModule>
</IfModule>

<IfModule mod_rewrite.c>
RewriteEngine on
RewriteRule .* - [env=HTTP_AUTHORIZATION:%{HTTP:Authorization}]
RewriteRule ^\.well-known/host-meta /public.php?service=host-meta [QSA,L]
RewriteRule ^\.well-known/host-meta\.json /public.php?service=host-meta-json [QSA,L]
RewriteRule ^\.well-known/carddav /remote.php/dav/ [R=301,L]
RewriteRule ^\.well-known/caldav /remote.php/dav/ [R=301,L]
RewriteRule ^remote/(.*) remote.php [QSA,L]
RewriteRule ^(?:build|tests|config|lib|3rdparty|templates)/.* - [R=404,L]
RewriteCond %{REQUEST_URI} !^/.well-known/acme-challenge/.*
RewriteRule ^(?:\.|autotest|occ|issue|indie|db_|console).* - [R=404,L]
</IfModule>
<IfModule mod_mime.c>
AddType image/svg+xml svg svgz
AddEncoding gzip svgz
</IfModule>
<IfModule mod_dir.c>
DirectoryIndex index.php index.html
</IfModule>
AddDefaultCharset utf-8
Options -Indexes
<IfModule pagespeed_module>
ModPagespeed Off

O problema é que se eu usar os dois .htaccess o owncloud não pode fazer upload do arquivo, se eu desligar o .htaccess no a.com, o trabalho do owncloud ok, mas o mod_expires do a.com não funciona. Minha pergunta é que posso combinar esse 2 .htaccess? se sim, como combinar?
Caso contrário, como fazer isso 2 .htaccess funcionando corretamente? Muito obrigado antecipadamente.