Ring studies showed that the trees died between 800 and 1,400 years ago.
(Ring studies; showed; that the trees died between 800 and 1,400 years ago) Context(Ring studies showed,List([0, 19))):(the trees; died; L:between; T:800 and 1,400 years ago)
Ring studies showed,List([0, 19))
Ring studies the trees
showed died
that the trees died between 800 and 1,400 years ago
L:between T:800 and 1,400 years ago