Complex sentence: The band is currently under the direction of CW2 Stephen K. Rivero after the retirement of the nation's senior-most band Warrant Officer, CW5 Douglas A. Phifer.
Split into simpler sentences: The band is currently under the direction of CW2 Stephen K. Rivero. CW2 Rivero assumed command after the retirement of the nation's senior-most band Warrant Officer, CW5 Douglas A. Phifer.