Complex sentence: Michel Pintoin has been identified as a monk at the Basilica of St Denis, an abbey which had a reputation for writing chronicles and the monks at St Denis were considered the official chroniclers of the Valois kings and were given access to official documents.
Split into simpler sentences: Michel Pintoin has been identified as a monk at the Basilica of St Denis, an abbey which had a reputation for writing chronicles. The monks at St Denis were considered the official chroniclers of the Valois kings and were given access to official documents.