Complex sentence: Liverpool Football Club are an English professional football club based in Liverpool, Merseyside, whose team has regularly taken part in Union of European Football Associations (UEFA) competitions, winning a British record total of eleven trophies since their first appearance in 1964.
Split into simpler sentences: Liverpool Football Club are an English professional football, that has regularly taken part in Union of European Football Associations (UEFA) competitions. They have won a British record of eleven trophies since their first appearance in 1964.