Complex sentence: The present Forest of Bere is a much smaller than the former Royal forest that once stretched from the River Test at King's Somborne in the west through Hursley, Eastleigh, Bishop's Waltham and Denmead to Rowland's Castle in the east.
Split into simpler sentences: The present Forest of Bere is a much smaller than when it was a Royal forest. At one time it stretched from the River Test at King's Somborne in the west through Hursley, Eastleigh, Bishop's Waltham and Denmead to Rowland's Castle in the east.