sentences:  The weather, previously warm and dry, became much wetter as the Bronze Age continued, forcing the population away from easily defended sites in the hills and into the fertile valleys.Large livestock farms developed in the lowlands which appear to have contributed to economic growth and inspired increasing forest clearances.The Deverel-Rimbury culture began to emerge in the second half of the 'Middle Bronze Age' (c. 1400–1100 BC) to exploit the wetter conditions.