Complex sentence: Rightmove makes money from listing estate agents on its website, another major source of income for Rightmove is their additional advertising products, which are purchased by estate agents, the ads are visable to users who search for the area chosen by the estate agent.
Split into simpler sentences: Rightmove makes money from listing estate agents on its website and offering additional advertising products to those agents. The ads are visable to users who search for the area chosen by the estate agent.