Complex sentence: Dretar survived assassination attempts but was isolated in the Bihac enclave throughout the war and as such could not oppose Boban effectively.Stjepan Kljuic survived a poisoning and remained opposed to Boban for the duration of the war.
Split into simpler sentences: Dretar survived assassination attempts but was isolated in the Bihać enclave throughout the war and as such could not oppose Boban effectively. Stjepan Kljuić survived a poisoning and remained opposed to Boban for the duration of the war.