Complex sentence: Of the 921,000 weekday bus trips, 554,000 are provided by the State Transit Authority of New South Wales, a government authority, the remainder by a large number of private-sector operators.
Split into simpler sentences: Of the 921,000 bus trips taken of a weekday, 554,000 are carried by the State Transit Authority of New South Wales, a government authority. The remainder are carried by a large number of private-sector operators.