Complex sentence: As a tango pianist, he played with several orchestras, including the orchestra of Juan d'Arienzo from 1935 to 1938, and is often partly credited with the development of d'Arienzo's rhythmic style.
Split into simpler sentences: As a tango pianist, he played with several orchestras. He played for the orchestra of Juan d'Arienzo from 1935 to 1938, and is often partly credited for the development of D'Arienzos rhythmic style.