When the easterly trade winds in the tropics have been blowing strongly for a very long period period of time water builds up in the western Pacific Ocean.
(the easterly trade winds in the tropics; have been blowing; strongly; T:for a very long period period of time water) (When the easterly trade winds in the tropics have been blowing strongly for a very long period period of time water; builds up; L:in the western Pacific Ocean)
the easterly trade winds in the tropics When the easterly trade winds in the tropics have been blowing strongly for a very long period period of time water
have been blowing builds up
strongly T:for a very long period period of time water
L:in the western Pacific Ocean