Original sentence: However, there are currently three skyscrapers under construction that will overtake One Canada Square in terms of height: Heron Tower (246m), Bishopsgate Tower (288m),  and The Shard (310m), which will become the tallest building in the UK when it is completed in 2012
Edited sentence: However, there are currently three skyscrapers under construction that will overtake One Canada Square in terms of height: Heron Tower, Bishopsgate Tower,  and The Shard