Simplify the following text for a Grade 4 native English-speaking person.
Original: She then went on to sing the title role in Arabella ( her signature role ) for the first time in her life - at the Bavarian State Opera House in Munich in 1951 .
Simplified: She sang the part of Arabella for the first time at the Bavarian State Opera House in Munich in 1951 . She was to become most famous for this role .