Original sentence: However, Federer won two Grand Slams in a year for four consecutive years (2004–07) and then again for fifth time in 2009.Only Sampras(1993–95 & 97) have won two grand slams in a calendar year four different times in their career
Edited sentence: (2004–07, 09).Roger Federer surpassed this former record in 2009, by winning Wimbledon, the 5th time he had won at least 2 slams in a calendar year.Sampras won two grand slams in a calendar year four times: (1993–95, 97)