Complex sentence: He and Tracey have a son, Garth, who becomes a chef after going to boarding school, and eventually marries Kimberley; this marriage doesn't last as in series ten, Garth has moved to Australia and started a relationship with a girl named Marcie.
Split into simpler sentences: He and Tracey have a son, Garth, who becomes a chef after going to boarding school, and eventually marries Kimberley. This marriage does not last: in series 10, Garth has moved to Australia and started a relationship with a girl named Marcie.