Complex sentence: Since they connected with Klaus Kettner's Rock It Concerts (Germany) in 1991 they have played hundreds of shows all over Europe, dozens of television shows and in March 2007 pre-opened the Bill-Haley-Museum in Munich, Germany.
Split into simpler sentences: Since they connected with Klaus Kettner's Rock It Concerts (Germany) in 1991, they have played hundreds of shows all over Europe and have appeared on dozens of television shows. In March 2007 pre-opened the Bill-Haley-Museum in Munich, Germany.