Complex sentence: She continued to tour for the next few years and then, in 1887, she began her long and successful association with George Edwardes and the Gaiety with "Monte Cristo Junior", taking over the role of Mariette which was created by Lottie Collins.
Split into simpler sentences: She continued to tour for the next few years and then, in 1887, she began her long and successful association with George Edwardes and the Gaiety in "Monte Cristo Junior". She took over the role of Mariette which was created by Lottie Collins.