Complex sentence: "(Sittin'on) The Dock of the Bay" was released in January 1968 and became Redding's only single to reach number one on the "Billboard" Hot 100 and the first posthumous number-one single in US chart history.
Split into simpler sentences: (Sittin'on) The Dock of the Bay was released in January 1968. It became Redding's only single to reach number one on the "Billboard" Hot 100 and the first posthumous number-one single in U.S. chart history.