Complex sentence: Rayson claimed that Costello, who had played no part in asylum seeker policy, was not her target: she was satirising the government as a whole, and exploring the phenomenon of the family rent by political division.
Split into simpler sentences: Rayson claimed that Costello, who had played no part in asylum seeker policy, was not her target. She was satirising the government as a whole, and exploring the phenomenon of the family rent by political division.