Simplify the following text for a Grade 5 native English-speaking person.
Original: The Williams pear is thought to date from 1765 to 1770 from the yard of an Aldermaston , England , schoolmaster named Mr. Stair or Mr. Wheeler , giving rise to the now-obscure synonyms Aldermaston pear and Stairs pear .
Simplified: The Williams pear is thought to date from 1765 to 1770 from the yard of an Aldermaston , England , schoolmaster named Mr. Stair or Mr. Wheeler , giving rise to the now-obscure names Aldermaston pear and Stairs pear .