Complex sentence: He took the Frankish throne from 768, became King of Italy from 774, and from 800 was the first recognized "Roman" emperor in Western Europe since the collapse of the Western Roman Empire three centuries earlier.
Split into simpler sentences: He took the Frankish throne from 768 and became King of Italy from 774. From 800 he became the first Holy Roman Emperor-the first recognized "Roman" emperor in Western Europe since the collapse of the Western Roman Empire three centuries earlier.