Because several large eruptions occurred at the same time as ENSO events, the warming produced by the ENSO masked the volcanic cooling during the first year after the eruption.
(several large eruptions; occurred; T:at the same time as ENSO events) (the warming; produced; by the ENSO) (the warming produced by the ENSO; masked; the volcanic cooling; T:during the first year; T:after the eruption)
several large eruptions the warming the warming produced by the ENSO
occurred produced masked
T:at the same time as ENSO events
by the ENSO
the volcanic cooling T:during the first year T:after the eruption