Complex sentence: Renowned Minangkabau imam in Mecca, Ahmad Khatib al-Minangkabawi had contributed greatly to the reformist training and was singlehandedly responsible for educating many of the essential Muslim figures during this time.
Split into simpler sentences: Renowned Minangkabau imam in Mecca, Ahmad Khatib al-Minangkabawi had contributed greatly to the reformist training. He was singlehandedly responsible for educating many of the essential Muslim figures during this time.