Complex sentence: Battistini worked, too, with the top-class conductor Luigi Mancinelli and the composer Augusto Rotoli, and he consulted an illustrious baritone of the previous generation, Antonio Cotogni, in an effort to refine his technique.
Split into simpler sentences: Battistini worked, too, with the top-class conductor Luigi Mancinelli and the composer Augusto Rotoli. He would also consult a world-famous teacher and baritone of the previous generation, Antonio Cotogni, in order to enhance his technique.