Simplify the following text for a Grade 7 native English-speaking person.
Original: Whilst in England King married Anna Josepha Coombe ( His First Cousin ) on 11 March 1791 and returned shortly after on HMS Gorgon to take up his post as Lieutenant-Governor of Norfolk Island , at an annual salary of Â # 250 .
Simplified: He married Anna Josepha Coombe on March 11 , 1791 , and they left for Australia four days later .