Complex sentence: The findings in the paper indicate that for the areas of the reserve patrolled by national wildlife agents, game was relatively plentiful, but that the majority of the reserve was poorly patrolled and the game animals over-harvested and significantly stressed by poachers and agricultural activity.
Split into simpler sentences: The findings in the paper indicate that in areas of the reserve that were patrolled by national wildlife agents, game was relatively plentiful. However, the majority of the reserve was poorly patrolled leaving game animals over-harvested and significantly stressed by poachers and agricultural activity.