Complex sentence: Portions of Carroll Gardens and Cobble Hill were granted landmark status in the 1970s and carved out of Red Hook which is a peninsula between Buttermilk Channel, Gowanus Bay and Gowanus Canal at the southern edge of Downtown Brooklyn.
Split into simpler sentences: Portions of Carroll Gardens and Cobble Hill were granted landmark status in the 1970s and carved out of Red Hook. It is a peninsula between Buttermilk Channel, Gowanus Bay and Gowanus Canal at the southern edge of Downtown Brooklyn.