Simplify the following text for a Grade 6 native English-speaking person.
Original: The quest for the Holy Grail makes up an important segment of the Arthurian cycle , appearing first in works by ChrÃ tien de Troyes .
Simplified: Many stories of the Arthurian Legend are about the Holy Grail . The first to write about it was ChrÃ tien de Troyes .