Complex sentence: Locally known as Speke Airport and Liverpool Airport, it was formally known as RAF Speke, the airport is within the City of Liverpool on the estuary of the River Mersey some southeast of the city centre.
Split into simpler sentences: Locally known as Speke Airport and Liverpool Airport, it was formerly known as RAF Speke. The airport is within the City of Liverpool on the estuary of the River Mersey some southeast of the city centre.