Original sentence: Due to the success of the new Flexity 2 trams, these trams aren't used as regularly, but in February 2015, Blackpool transport announced that three of the fleet would operate in passenger service.During 2011, a number of Balloon and Millennium class trams were modernised so that they could operate in ordinary revenue service after the £100 million refurbishment of the whole tramway
Edited sentence: During 2011, a number of Balloon and Millennium class trams were modernised so that they could operate in ordinary revenue service after the £100m refurbishment of the whole tramway.Unfortunately, due to the huge success of the new Flexity 2 trams, these trams aren't used as regularly, but in Febuary 2015, Blackpool transport announced that three of the fleet would operate in passenger service