Complex sentence: The act also established the position of Vice-Chairman of the Joint Chiefs and simplified the chain of command, increased the ability of the Chairman of the Joint Chiefs of Staff to direct overall strategy, and provided far greater power to "Unified and Specified" field commanders.
Split into simpler sentences: The act also established the position of Vice-Chairman of the Joint Chiefs and simplified the chain of command. It increased the ability of the Chairman to direct overall strategy, but provided greater command authority to "unified" and "specified" field commanders.