Simplify the following text for a Grade 8 native English-speaking person.
Original: In 1828 the explorer Charles Sturt and Hamilton Hume were sent by the Governor of New South Wales , Sir Ralph Darling , to investigate the course of the Macquarie River .
Simplified: In 1828 the explorer Charles Sturt was sent by the Governor of New South Wales , Sir Ralph Darling , to find the path of the Macquarie River .