In this example, the change in the water temperature was due to a warm current called El Nino, but global warming is also causing some concern.
(the change in the water temperature; was; due to a warm current; L:In this example) (a warm current; called; El Nino) (global warming; is causing; some concern)
the change in the water temperature a warm current global warming
was called is causing
due to a warm current L:In this example
El Nino
some concern