Complex sentence: He then became a director of respiratory therapy at a West American hospital until 1980 when he was approached by a management company which specialized in questionably reformed bands with big names, and began to tour under the Deep Purple name with a bunch of unknown session musicians.
Split into simpler sentences: He then became a director of respiratory therapy at a West American hospital until 1980. In 1980 he was approached by a management company which specialized in questionably reformed bands with big names, and began to tour under the Deep Purple name with a bunch of unknown session musicians.