Complex sentence: She began to warm up to her parents after her mother said they never agreed to give her up and after her parents agreed to let her play with the Bakers' daughter, Aimee, who had always been her closest companion.
Split into simpler sentences: She began to warm up to her parents after her mother said they never agreed to give her up. Later her parents agreed to let her play with the Bakers' daughter, Aimee, who had always been her closest companion.