Solution is simple.
just find this code inside .htaccess
# For Friendly URLs
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ index.php?q=$1 [L,QSA]
Modify and paste this code over the code above.
RewriteRule ^oldpage\.html$ http://www.samplepage.com/new page.html [L,NC,R=301]
that is all.
should look like this:
RewriteRule ^oldpage\.html$ http://www.samplepage.com/new page.html [L,NC,R=301]
# For Friendly URLs
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ index.php?q=$1 [L,QSA]

i hope this works!!!