Complex sentence: Three years later he found immediate success as a dramatist with "London Assurance", produced at Covent Garden on 4 March 1841, with a cast that included such well-known actors as Charles Mathews, William Farren, Mrs Nesbitt, and Madame Vestris.
Split into simpler sentences: Three years later he found immediate success as a dramatist with "London Assurance". Produced at Covent Garden on 4 March 1841, its cast included such well-known actors as Charles Mathews, William Farren, Mrs Nesbitt, and Madame Vestris.