Complex sentence: John XXII initiated a large number of building projects, including additions to the Palais des Papes in Avignon as well as defensive castles at Barbentane, Bédarrides, Noves and Sorgues.
Split into simpler sentences: John XXII initiated a large number of building projects. These included the extension of the Palais des Papes in Avignon as well as defensive castles at Barbentane, Bédarrides, Noves and Sorgues.