Simplify the following text for a Grade 6 native English-speaking person.
Original: Gilbert then sailed for Sydney , in the middle of June 1840 took ship to Port Essington in the north of Australia , and in March 1841 sailed to Singapore calling at Timor on the way .
Simplified: Gilbert then sailed for Sydney , and in June 1840 took a ship to Port Essington in the north of Australia . In March 1841 he sailed to Singapore , stopping at Timor on the way .