Complex sentence: In August 2010, giant sheet of ice measuring, more than four times the area of Manhattan island, broke off from Petermann with researchers from the Canadian Ice Service locating the calving from NASA satellite images taken on August 5th.
Split into simpler sentences: In August 2010, a giant sheet of ice measuring, more than four times the area of Manhattan island, broke off from the Petermann Glacier. Researchers from the Canadian Ice Service located the calving from NASA satellite images taken on August 5th.