Simplify the following text for a Grade 7 native English-speaking person.
Original: In 1888 , he married Alison Pettie , daughter of the painter John Pettie who had painted MacCunn 's portrait several times .
Simplified: In 1888 , he married Alison Pettie , daughter of John Pettie , RA , who had painted MacCunn 's portrait several times .