Complex sentence: In return they have to pay for operating costs, investments and in the case of Manila a concession fee to the Filipino government to pay for the legacy debt and the relatively modest cost of running a regulatory office.
Split into simpler sentences: In return they have to pay for operating costs and investments. In addition, in the case of Manila they have to pay a concession fee to the government in order to pay for the legacy debt and the relatively modest cost of running a regulatory office.