Complex sentence: Born Boguslaw, the son of Polish Duke of Pomerania Wartislaw VII and Mary of Mecklenburg-Schwerin, Eric's paternal grandparents were Boguslaw V, Duke of Pomerania and his second wife Adelheid of Brunswick-Grubenhagen.
Split into simpler sentences: Born Boguslaw, the son of Polish Duke of Pomerania Wartislaw VII and Mary of Mecklenburg-Schwerin. His paternal grandparents were Boguslaw V, Duke of Pomerania and his second wife Adelheid of Brunswick-Grubenhagen.