Complex sentence: They escape the facility in military trucks with Zakhaev's forces in hot pursuit, though an ultranationalist Mi-24 Hind helicopter destroys a vital bridge during their escape, trapping the joint force.
Split into simpler sentences: They escape the facility in military trucks with Zakhaev's forces in hot pursuit. An ultranationalist Mi-24 Hind helicopter destroys a vital bridge and traps the joint force.