Simplify the following text for a Grade 11 native English-speaking person.
Original: Frederick William was a staunch Romanticist , and his devotion to this movement , which in the German States featured a nostalgia for the Middle Ages , was largely responsible for him developing into a conservative at an early age .
Simplified: Frederick William was Romanticist , and had a nostalgia for the Middle Ages , therefore he was conservative already at an early age .