Complex sentence: However, his painting appeared in a signal box in the season 5 episodes "Bye George" and "Oliver's Find", and he also made a stock footage cameo in the Season 7 episode "Harold and the Flying Horse".
Split into simpler sentences: However, his painting appeared in a signal box in the season 5 episodes "Bye George" and "Oliver's Find". He later made a stock footage cameo in the Season 7 episode "Harold and the Flying Horse".