Complex sentence: From 13 December 2009 this station will be served by fast trains travelling over High Speed 1 reaching London St Pancras in 49 minutes, compared with the off-peak service from London Charing Cross which at the beginning of 2009 takes 79 minutes.
Split into simpler sentences: From 13 December 2009 this station will be served by fast trains travelling over High Speed 1 to reaching London St Pancras in 49 minutes. At the beginning of 2009 the off-peak service from London Charing Cross takes 79 minutes.