Complex sentence: From 1987 to 1996 he presented "Going for Gold", a popular lunchtime TV quiz show on BBC1, where he developed the catchphrases "What am I?" and "Now you're playing catchup".
Split into simpler sentences: From 1987 to 1996 he presented "Going for Gold", a significantly popular lunchtime TV quiz show on BBC1. Through his work on "Going for Gold", Henry developed the catchphrases "What am I?" and "Now you're playing catchup".