Complex sentence: Dave was also part of the squad that played in four Scottish Cup finals in 1987,1988,1991 and 1994, the latter being when United recorded their first Scottish Cup victory, defeating Rangers 1--0.
Split into simpler sentences: Dave was also part of the squad that played in four Scottish Cup Finals in 1987,1988,1991 and 1994. United lost the first three, but in 1994 United recorded their first Scottish Cup victory, defeating Rangers 1--0.