It was later determined by the Massachusetts DEP that the spill had most likely originated on the opposite side of the Charles River and been driven by the wind to the shore near MIT.
(It; was determined; by the Massachusetts DEP; T:later) Context(It was determined,List([0, 23))):(the spill; had most likely originated; L:on the opposite side of the Charles River)
It was determined,List([0, 23))
It the spill
was determined had most likely originated
by the Massachusetts DEP T:later
L:on the opposite side of the Charles River