Complex sentence: Frederick III (21 September 1415--19 August 1493), called the Peaceful, was Holy Roman Emperor from 1452 until his death, the first emperor of the House of Habsburg.
Split into simpler sentences: Frederick III (21 September 1415--19 August 1493), called the Peaceful, was the Holy Roman Emperor from 1452 until his death. He was the first emperor of the House of Habsburg.