Complex sentence: He resumed his routine of nightclub, cabaret and summer stock jobs with his new wife at his side, and, in 1971-72, appeared briefly in the West End and Broadway productions of the musical, "Ambassador", which flopped.
Split into simpler sentences: He resumed his routine of nightclub, cabaret and summer stock jobs with his new wife at his side. In 1971-72, Howard appeared briefly in the West End and Broadway productions of the musical, "Ambassador", which flopped.