Whatever their cause, prairie fires limited the growth of trees and large shrubs, thus keeping the forests at bay and ensuring the survival of the grasslands.
(prairie fires; limited; the growth of trees and large shrubs) Context(prairie fires limited,List([22, 43))):(prairie fires; limited the growth of trees and large shrubs thus keeping; the forests; at bay) Context(prairie fires limited,List([22, 43))):(prairie fires; limited the growth of trees and large shrubs ensuring; the survival of the grasslands)
prairie fires limited,List([22, 43)) prairie fires limited,List([22, 43))
prairie fires prairie fires prairie fires
limited limited the growth of trees and large shrubs thus keeping limited the growth of trees and large shrubs ensuring
the growth of trees and large shrubs
the forests at bay
the survival of the grasslands