Complex sentence: However, after an illness in 1891 he was transferred to the Bradford branch and he visited the theatre and saw the Oscar Wilde play "Lady Windermere's Fan", This stimulated his interest in plays.
Split into simpler sentences: However, after an illness he was transferred to the Bradford branch which enabled him to visit the theatre. A performance of Oscar Wilde's "Lady Windermere's Fan" in 1891 stimulated his interest in plays.