There is good suggestive data that multiple Tunguska events were involved, at least, and there is no evidence for major volcanic eruptions at that time (which argues strongly for a cosmic vector with the Taurid stream a most likely source).
(good suggestive data; were involved; that multiple Tunguska events) (no evidence for major volcanic eruptions at that time; argues strongly; for a cosmic vector with the Taurid stream)
good suggestive data no evidence for major volcanic eruptions at that time
were involved argues strongly
that multiple Tunguska events
for a cosmic vector with the Taurid stream