Change all occurrences of "deny" to allow, and disable all occurrences of "allow". Then move the “discard all” condition at the end to the top of the list.
eg.
<Limit GET HEAD POST>
order allow,deny
deny from 41.205.32.0/19
deny from ....
allow from all
</LIMIT>
becomes
<Limit GET HEAD POST>
order deny,allow
deny from all
allow from 41.205.32.0/19
allow from ....
</LIMIT>
There are good tutorials on .htaccess .