Complex sentence: On April 8,2016, the NFL announced Goodson had been suspended for the first four games of the 2016 season due to a violation of the league's policy on performance-enhancing substances.
Split into simpler sentences: On April 8,2016, the NFL announced Goodson had been suspended for the first four games of the 2016 NFL season. The ban was for violating the NFL's policy on performance-enhancing substances.