Complex sentence: The settlement of new land in Australia and North America led to drives of sheep and cattle over great distances by men on horseback, supported by wagons or packhorses, see Drover (Australian) and Cattle drives in the United States.
Split into simpler sentences: The settlement of new land in Australia and North America led to drives of sheep and cattle over great distances by men on horseback, supported by wagons or packhorses. See Drover (Australian) and Cattle drives in the United States.