Simplify the following text for a Grade 7 native English-speaking person.
Original: The monastery of Lindisfarne was founded by Irish born Saint Aidan , who had been sent from Iona off the west coast of Scotland to Northumbria at the request of King Oswald ca .
Simplified: The monastery of Lindisfarne was founded by Irish-born Saint Aidan . He had been sent from Iona off the west coast of Scotland to Northumbria around AD 635 .