Simplify the following text for a Grade 6 native English-speaking person.
Original: Guillaume de Machaut ( pronounce : `` GHEE-yoam de MA-show '' ) ( born around 1300 ; died April 1377 ) , was a Medieval French poet and composer .
Simplified: Guillaume de Machaut ( sometimes spelled Machault ) ( c. 1300 â `` April 1377 ) was a Medieval French poet and composer .