Complex sentence: In 1952, Shepherd began working as part of Bill Doggett's group, and in 1956, Shepherd helped write Doggett's signature song, "Honky Tonk".
Split into simpler sentences: In 1952, Shepherd began working as part of Bill Doggett's group. In 1956, Shepherd helped write Doggett's signature song, "Honky Tonk".