Complex sentence: The French championships were not held again until 1920, but Wimbledon resumed in 1919 and Lenglen debuted in the tournament--her first on grass--meeting seven-time winner Dorothea Douglass Chambers in the final.
Split into simpler sentences: The French championships were not held again until 1920, but Wimbledon was, again, organised for 1919. Lenglen entered the tournament--her first on grass--and met seven-time winner Dorothea Douglass Chambers in the final.