Complex sentence: Tran Huu Nghia successfully passed the one of the royal exams and contributed greatly to Vietnamese literature, however, what made hime well known laid in the fact that he made hát tuồng, then a royal music performance popular to the ordinary people.
Split into simpler sentences: Tran Huu Nghia successfully passed one of the royal exams and contributed greatly to Vietnamese literature. However, what made him well known lay in the fact that he made hát tuồng, then a royal music performance, popular to the ordinary people.