Complex sentence: The first play to achieve 500 consecutive performances was the London comedy "Our Boys", opening in 1875, which set an astonishing new record of 1,362 performances, bested in 1892 by "Charley's Aunt".
Split into simpler sentences: The first play to achieve 500 consecutive performances was the London comedy "Our Boys", opening in 1875. Its astonishing new record of 1,362 performances was bested in 1892 by "Charley's Aunt".