Complex sentence: The previous runway length was short for an airport with Birmingham's passenger throughput and range of destinations, and limited aircraft to destinations on the east coast or in the midwest of North America, in the Gulf and Middle East, or on the South Asian subcontinent.
Split into simpler sentences: The previous runway length was short for an airport with Birmingham's passenger throughput and range of destinations. The ole length limited aircraft to destinations on the east coast or in the midwest of North America, in the Gulf and Middle East, or on the South Asian subcontinent.