Complex sentence: Maya demonstrates her ability to use Magic when she again loses control of it during the party's first encounter with Doplin's pet demon Slogar, and is not enough to kill Slogar, but it render him vulnerable to attacks, allowing Lang and Kazan to defeat.
Split into simpler sentences: Maya demonstrates her ability to use Magic when she again loses control of it during the party's first encounter with Doplin's pet demon Slogar. This act isn't enough to kill Slogar, but it render him vulnerable to attacks, allowing Lang and Kazan to defeat.