Complex sentence: He is a leading voice-over artist and has starred in many TV series, has extensive theatre and film credits and for a two hundred pound buyout voiced the "mind the gap" warnings on the Piccadilly Line of the London Underground.
Split into simpler sentences: He is a leading voice-over artist and has also starred in television series and has theatre and film credits. For a £200 "buyout", he recorded the "mind the gap" warnings on the Piccadilly Line of the London Underground.