Complex sentence: The east window contains four stained glass panels dating from 1530-1542 which originate from Steinfeld Abbey near Cologne, from which they were removed following the seculatisation of the abbey in 1802.
Split into simpler sentences: The east window contains four stained glass panels dating from 1530-1542. They originate from Steinfeld Abbey near Cologne, from which they were removed following the seculatisation of the abbey in 1802.