Complex sentence: Riley trained at the Guildhall School of Music with Leonard Stehn and was a cellist for Virginia Astley from 1983 to 1986 and a one-time auxiliary member of The Family Cat.
Split into simpler sentences: Riley trained at the Guildhall School of Music with Leonard Stehn. She was a cellist for Virginia Astley from 1983 to 1986 and a one-time auxiliary member of The Family Cat.