Complex sentence: In 2003, he then moved to talkbackTHAMES and became the editor of their factual programmes & was the editor of one of their most successful shows, "How Clean Is Your House?", which began on Channel 4 in 2003.
Split into simpler sentences: In 2003, he then moved to talkbackTHAMES and became the editor of their factual programmes. He was the editor of one of their most successful shows, "How Clean Is Your House?", which began on Channel 4 in 2003.