Complex sentence: As a result, while up-current the beaches actually grew, in Westhampton Beach there was increased erosion at the beaches, and during the late 1970s and through the 1980s beach homes were washed away with every severe storm (nor'easter) that hit the coast.
Split into simpler sentences: As a result, there was increased erosion at the beaches in Westhampton Beach while, up current, the beaches actually grew. During the late 1970s and through the 1980s, beach homes were washed away with every severe storm (nor'easter) that hit the coast.