Original sentence: The Soviet Union, which only began competing in 1954 and last competed in 1991, won a medal at every single championship in which it participated
Edited sentence: The Soviet Union, which only began competing in 1954 and last competed in 1991, were the most dominant nation in world championship history, capturing a medal in every tournament they entered between 1954 and 1991 and winning 22 World Championships at 35 appearances