Complex sentence: Prince Woldemar's decision to appoint Prince Adolf was the beginning of a decade long dispute between two lines of the House of Lippe, the Lippe-Biesterfeld's led by Count Ernst who claimed the regency, and the princes of Schaumburg-Lippe.
Split into simpler sentences: Prince Woldemar's decision to appoint Prince Adolf was the beginning of a decade-long dispute between two lines of the House of Lippe. The Lippe-Biesterfeld line led by Count Ernst, who claimed the regency, and the princes of Schaumburg-Lippe.