Complex sentence: The locality was founded as a fishing village around 1900, and remained so until the late 20th century when in rapid succession 7 farms were granted planning permission to be sold off as land allotments in an urban development.
Split into simpler sentences: The locality was founded as a fishing village around 1900. It remained a fishing village until the late 20th century when in rapid succession 7 farms were granted planning permission to be sold off as land allotments in an urban development.