Complex sentence: In fact, Maurice Grevisse, a Belgian, is the most renowned French grammarian of all and is known around the French community for his 1600 pages reference book on French grammar, "Le bon usage", which received an award from the Académie française.
Split into simpler sentences: In fact, Maurice Grevisse, a Belgian, is the most renowned French grammarian of all. He is known around the French community for his 1600 pages reference book on French grammar, "Le bon usage", which received an award from the Académie française.