Simplify the following text for a Grade 9 native English-speaking person.
Original: Catherine married Henry VIII on 28 July 1540 , at Oatlands Palace in Surrey , almost immediately after the annulment of his marriage to Anne of Cleves was arranged .
Simplified: In July 1540 , after Henry had annul Anne of Cleves , Henry and Catherine got married at Oatlands Palace in Surrey .