Complex sentence: He's married with one child, but separates from his wife, Ellie, after the fifth series, whom he first met at university, before she dumped him due to his decision to join the police force.
Split into simpler sentences: He's married with one child, but separates from his wife, Ellie, after the fifth series. They first met at university, before she dumped him due to his decision to join the police force.