Complex sentence: In the first round of the US Open she beat Alla Kudryavtseva 3--6,6--3,6--2, but lost to Gisela Dulko in the second round.
Split into simpler sentences: In the first round of the US Open she beat Alla Kudryavtseva 3--6,6--3,6--2. However, she lost to Gisela Dulko in the second round.