Complex sentence: According to Fred Frith Roelofs attended a Henry Cow concert in Amsterdam in December 1977 and began playing trombone from the audience, which led to her touring with the band the following year, and playing on their last album in July and August 1978.
Split into simpler sentences: According to Fred Frith Roelofs attended a Henry Cow concert in Amsterdam in December 1977 and began playing trombone from the audience. This led to her touring with the band the following year, and playing on their last album in July and August 1978.