Complex sentence: This created a key flashpoint in the US government became PAVN troop levels, was it 500k or more as the CIA believed, or 300k or less as the commanders of US forces in Vietnam believed.
Split into simpler sentences: This created a key flashpoint in the US government, PAVN troop levels,. Was it 500k or more as the CIA believed, or 300k or less as the commanders of US forces in Vietnam believed.