Complex sentence: Things become complicated when she meets Tom McCormack (Thomas Lockyer), who is unsatisfied with their one night stand and begins to pursue Siobhan, showing up at Siobhan's home and becoming a client at work in a bid to insert himself into her life.
Split into simpler sentences: Things become complicated when she meets Tom McCormack (Thomas Lockyer), who is unsatisfied with their one night stand. McCormack begins showing up at Siobhan's home and work, trying to insert himself into her life.