Complex sentence: His early comedy career started when he competed in the Johnnie Walker Comedy Search in 1989 and included many outlets such as Comedy Central, where he had been a recurring guest voice on the show "Dr. Katz, Professional Therapist".
Split into simpler sentences: His early comedy career started when he competed in the Johnnie Walker Comedy Search in 1989. His career included many outlets, such as Comedy Central, where he had been a recurring guest voice on the show "Dr. Katz, Professional Therapist".