Complex sentence: Speculation arose that he had been killed by former Securitate agents, due to political articles in which he attacked the Communist regime--however, the murder occurred a year and a half after the Romanian Revolution and Nicolae Ceauşescu's death.
Split into simpler sentences: Speculation arose that he had been killed by former Securitate agents, due to political articles in which he attacked the Communist regime. The murder occurred a year and a half after the Romanian Revolution and Nicolae Ceauşescu's death.