Complex sentence: Abbot Mathias Lang (1615-40), from Weingarten Abbey, reformed it, and in 1634 Marienberg joined the Benedictine Congregation of Swabia.
Split into simpler sentences: Abbot Mathias Lang (1615-40), from Weingarten monastery, became the reformer of the abbey. In 1634 Marienberg joined the Benedictine Congregation of Swabia.