Original sentence: Both of whom formed from cricket clubs, and Rotherham United, who will play at the Don Valley Stadium for the next 3–4 years following a dispute with their previous landlords at Millmoor.There are now three professional clubs in the Football League two of whom play in the Football League Championship: Sheffield United(the best team) and Sheffield Wednesday, or piggys as they are known
Edited sentence: There are now three professional clubs in the Football League two of whom play in the Football League Championship: Sheffield United and Sheffield Wednesday, both of whom formed from cricket clubs, and Rotherham United, who will play at the Don Valley Stadium for the next 3–4 years following a dispute with their previous landlords at Millmoor