Complex sentence: He and other pupils were taught guitar playing in the music room at her house in the Hollywood Hills where she taught a technique of playing with the right hand using the pads of the fingers to pluck the strings, rather than the fingernails.
Split into simpler sentences: He and other pupils were taught guitar playing in the music room at her house in the Hollywood Hills. She taught a technique of playing with the right hand using the pads of the fingers to pluck the strings, rather than the fingernails.