Complex sentence: Fiona also keeps up with Michael's mother, Madeline Westen, however, it is unclear if she does this because she enjoys Madeline's company, or if she simply uses it to pressure Michael.
Split into simpler sentences: Fiona also keeps up with Michael's mother, Madeline Westen. However, it is unclear if she does this because she enjoys Madeline's company, or if she simply uses it to pressure Michael.