Complex sentence: He remains one of the towering personalities of the peak era of Indian People Theatre Association (IPTA) as a cultural delegate of which he visited China twice in the early 1950s with other great cultural luminaries from India.
Split into simpler sentences: He remains one of the towering personalities of the peak era of Indian People Theatre Association (IPTA). As a cultural delegate he visited China twice in the early 1950s with other great cultural luminaries from India.