Complex sentence: Malcolm leads the apes into the tower, where he finds Dreyfus and learns that the return of electricity allowed Dreyfus' men to make radio contact with survivors at a military base, who are now coming to fight the apes.
Split into simpler sentences: Malcolm leads the apes into the tower, where he finds Dreyfus. He learns that the return of electricity allowed Dreyfus' men to make radio contact with survivors at a military base, who are now coming to fight the apes.