Complex sentence: Meyerbeer stopped work on the opera in 1827 when the theatre underwent financial difficulties; in August 1829 the composer and librettists agreed to refashion the work in a five act form to meet the requirements of the Paris Opéra.
Split into simpler sentences: Meyerbeer stopped work on the opera in 1827 when the theatre underwent financial difficulties. In August 1829, the composer and librettists agreed to refashion the work in a five act form to meet the requirements of the Paris Opéra.