Complex sentence: He was a semi-regular character and his first appearance on screen was in February 1986, when he visited Lou after 20 years to return Albert's watch, which Lou had recently given to her grandson, Simon Wicks.
Split into simpler sentences: He was a semi-regular character and his first appearance on screen was in February 1986. He visited Lou after 20 years to return Albert's watch, which Lou had recently given to her grandson, Simon Wicks.