Complex sentence: The ticket office is located within the station building under the c2c platformas, and is managed by c2c; tickets can be retailed for National Rail services, the DLR and on Oyster card.
Split into simpler sentences: The ticket office is located within the station building, and is managed by c2c. Tickets can be retailed for National Rail services, the Docklands Light Railway and on Oyster card.