Complex sentence: Safiur Rahman Mubarakpuri (6 June 1943--1 December 2006) was an Indian writer, best known for his "The Sealed Nectar" ("Ar-Raheeq Al-Makhtum"), a biography of the Islamic prophet Muhammad.
Split into simpler sentences: Safiur Rahman Mubarakpuri (6 June 1943--1 December 2006) was an Indian writer. He was the author of "Ar-Raheeq Al-Makhtum" a biography book of the Islamic prophet Muhammad.