Complex sentence: Founders Bartlett Richards and William Comstock successfully managed the ranch into the early twentieth century and with open-range grazing and ready markets for cattle the ranch grew to around 500,000 acres (2023 km²).
Split into simpler sentences: Founders Bartlett Richards and William Comstock successfully managed the ranch into the early twentieth century. With open-range grazing and ready markets for cattle the ranch grew to 500,000 acres (2023 km²).