Simplify the following text for a Grade 9 native English-speaking person.
Original: On 2 December 1971 Dubai , together with Abu Dhabi and five other emirates , formed the United Arab Emirates after the former protector , Britain , left the Persian Gulf in 1971 .
Simplified: On 2 December 1971 Dubai formed the United Arab Emirates , together with Abu Dhabi and five other emirates . This was done after former protector Britain left the Persian Gulf in 1971 .