When enough water has evaporated then it will form a cloud and the cycle will start again.
(enough water; has evaporated; ) (it; will form; a cloud; T:When enough water has evaporated; T:then) (the cycle; will start; T:again)
enough water it the cycle
has evaporated will form will start
a cloud T:When enough water has evaporated T:then
T:again