Complex sentence: As well as his US Open doubles semi-finals appearance in 1998, Koenig reached the R16 twice at Wimbledon in 1997 and 1998 and the quarter-finals at on 3 other ocassions US Open in 1997,2001 and 2004.
Split into simpler sentences: As well as his US Open doubles semi-finals appearance in 1998, Koenig reached the R16 twice at Wimbledon in 1997 and 1998. He was also a quarter-finalist on 3 other occasions at the US Open in 1997,2001 and 2004.