Complex sentence: Rock-Olga, real name Birgit Magnusson, née Jacobsson (16March 194010June 2010) was a Swedish singer and was known as one of Sweden's first rock musicians of the 1950s.
Split into simpler sentences: Rock-Olga, real name Birgit Magnusson, née Jacobsson (16March 194010June 2010) was a Swedish singer. She was one of Sweden's first rock musicians during the 1950s.