Complex sentence: Tickets for the bus to the airport can be bought from any rail retailer, be aware tickets to Birmingham International can be routed via New Street or the bus, although the same price these are not interchangeable.
Split into simpler sentences: Tickets for the bus to the airport can be bought from any rail retailer. Tickets to Birmingham International can be routed via New Street or the bus, although the same price these are not interchangeable.