Complex sentence: Janice, during a conversation with Carmela, calls into question whether or not her mother loves them, and that in therapy her therapist explained to her that she does indeed love them, but does not know how to express it.
Split into simpler sentences: Janice, during a conversation with Carmela, calls into question whether or not her mother loves them. She goes on to explain that her therapist explained to her that Livia does indeed love them, but does not know how to express it.