Complex sentence: The author, Malik Ghulam Farid who has also edited the five-volume The English Commentary of the Holy Quran covering about 3000 pages writes that during the editing work of the Commentary, he also worked upon the preparation of a Dictionary of the Holy Quran.
Split into simpler sentences: The author, Malik Ghulam Farid, also edited the five-volume The English Commentary of the Holy Quran, covering about 3000 pages. He writes that during the editing work of the Commentary, he also worked upon the preparation of a Dictionary of the Holy Quran.