Complex sentence: He joined Tata Group as Director in 1939 and was served the group till 1959 and served as a director in various companies like-ACC, Tata Hydro, Indian Hotels.
Split into simpler sentences: He joined Tata Group as Director in 1939 and served the group till 1959. He also served as director in various companies like-ACC, Tata Hydro, Indian Hotels.