Complex sentence: Muhammad ibn Tusi, commonly known as Shaykh Tusi, lived during the first half of the 5th century AH and is the most well-known jurist and Mujtahid of the Shia.
Split into simpler sentences: Muhammad ibn Tusi, commonly known as Shaykh Tusi, lived during the first half of the 5th century AH. He is the best known jurist and Mujtahid of the Shia.