As cooling went on over long periods of time eventually the water vapor condensed to form droplets of rain, and it rained for thousands of years.
(cooling; went on; T:over long periods of time) (the water vapor; condensed; to form droplets of rain; T:eventually) (the water vapor; to form; droplets of rain)
cooling the water vapor the water vapor
went on condensed to form
T:over long periods of time
to form droplets of rain T:eventually
droplets of rain