Simplify the following text for a Grade 5 native English-speaking person.
Original: With Borussia MÃ nchengladbach he played the UEFA Cup Final 1973 and the European Cup Final in 1977 ( now Champions League ) . This finals were both lost against Liverpool F.C. .
Simplified: He was also in the Borussia MÃ nchengladbach team when they lost to Liverpool F.C. in the UEFA Cup final in 1973 and the European Cup in 1977 .