Complex sentence: The card was headlined by a heavyweight title fight between UFC veterans Paul Buentello and Tim Sylvia; however, Sylvia weighed in at 274.4 lbs which would technically place him in the super heavyweight division.
Split into simpler sentences: The card was headlined by a heavyweight title fight between UFC veterans Paul Buentello and Tim Sylvia. However, Sylvia weighed in at 274.4 lbs which would technically place him in the super heavyweight division.