"In just the past few years we've seen repeated calamities caused by drought, floods, hurricanes and tornados.
(we; 've seen; repeated calamities caused by drought, floods, hurricanes and tornados; T:In just the past few years) (repeated calamities; caused; by drought, floods, hurricanes and tornados)
we repeated calamities
've seen caused
repeated calamities caused by drought, floods, hurricanes and tornados T:In just the past few years
by drought, floods, hurricanes and tornados