Complex sentence: Between 1920 and 1961, the peninsula was subdivided into 776 residential allotments, further buildings and infrastructure were erected within the penguin colony, and the area became known as the Summerland Estate.
Split into simpler sentences: Between 1920 and 1961, the peninsula was subdivided into 776 residential allotments. Further buildings and infrastructure were erected within the penguin colony and the area became known as the Summerland Estate.