Complex sentence: In 2002, Bourne Leisure began integrating the individual Haven and British Holidays brands and eversince, many activities and facilities at Haven parks have operated under the names introduced at British Holidays resorts in the late 90s.
Split into simpler sentences: In 2002, Bourne Leisure began integrating the individual Haven and British Holidays brands. Henceforth, many activities and facilities at Haven parks now operated under the names introduced at British Holidays resorts in the late 90s.