Complex sentence: In 1353, Baliol was ensconced at Buittle in his ancestral territories in Galloway, Douglas lead a raid there to eject him as due to Baliol's forfeiture those lands had been made over to Sir James Douglas in 1324.
Split into simpler sentences: In 1353, Baliol was ensconced at Buittle in his ancestral territories in Galloway. Douglas led a raid there to eject him due to Baliol's forfeiture of those lands that had been made over to Sir James Douglas in 1324.