Complex sentence: They almost completely lacked political experience and so had no real idea of what the consequences of ending the dictatorship would be while the regime was simultaneously blamed both for failing to exact fuller commitments to Thailand and for excessive subservience to Washington.
Split into simpler sentences: They almost completely lacked political experience and so had no real idea of the consequences of ending the dictatorship. The regime was simultaneously blamed both for failing to exact fuller commitments from its allies, and for excessive subservience to Washington.