Complex sentence: Adolf of Nassau was the reigning count of a small German state, born in about 1255 as the son of Walram II, Count of Nassau and Adelheid of Katzenelnbogen.
Split into simpler sentences: Adolf of Nassau was the reigning count of a small German state. He was born about 1255 and was the son of Walram II, Count of Nassau and Adelheid of Katzenelnbogen.