Complex sentence: Upon listing the property, the real estate agency tries to obtain a buyer for the property and, in consideration of successfully finding a satisfactory buyer, the broker anticipates receiving a commission (fee) for the services the brokerage provided.
Split into simpler sentences: Upon listing the property, the real estate agency tries to get (or find) a buyer for the property. In consideration of the brokerage successfully finding a satisfactory buyer for the property, a real estate broker anticipates receiving a commission (fee) for the service the brokerage provided.