Complex sentence: Finding little support, he left after the siege to England where he died in 1340, his son John refused the Earldom, ending the Comyn lineage and the first creation, Mormaers of Buchan.
Split into simpler sentences: Finding little support, he left after the siege to England where he died in 1340. His son John refused the Earldom, ending the Comyn lineage and the first creation, Mormaers of Buchan.