An investigation later showed that temperatures were improperly recorded by the fireman.
(An investigation; showed; that temperatures were improperly recorded by the fireman; T:later) Context(An investigation showed,List([0, 29))):(temperatures; were improperly recorded; by the fireman)
An investigation showed,List([0, 29))
An investigation temperatures
showed were improperly recorded
that temperatures were improperly recorded by the fireman T:later
by the fireman