Original sentence: The sudden formation of a sinkhole was observed in Guatemala in June 2010, where torrential rains from Tropical Storm Agatha and a bad drainage system were blamed for creating a sinkhole which swallowed a three story building and a house
Edited sentence: The sudden formation of a sinkhole was observed in Guatemala in June 2010, where torrential rains from Tropical Storm Agatha and a bad drainage system were blamed for creating a huge sinkhole which swallowed a three story building and a house