Complex sentence: From March 1958 Formby appeared in the musical comedy "Beside the Seaside, a Holiday Romp" in Hull, Blackpool, Birmingham and Brighton; the production played to small audiences in Brighton, and the run was cut short as a result.
Split into simpler sentences: From March 1958 Formby appeared in the musical comedy Beside the Seaside, a Holiday Romp in Hull, Blackpool, Birmingham and Brighton. By the time it reached Brighton the play was playing to increasingly small audiences, and the run was cut short as a result.