Complex sentence: His outbreak of violence towards them seems to have occurred because he was swindled out of money by a prostitute and her pimp but he claimed, when interviewed by authorities, that the voice of God had sent him on a mission to kill prostitutes.
Split into simpler sentences: His outbreak of violence towards them seems to have occurred because he was swindled out of money by a prostitute and her pimp. When interviewed by authorities, however, he claimed that the voice of God had sent him on a mission to kill prostitutes.