Complex sentence: The 2015--16 Football League Trophy was the 32nd season in the history of the competition, a knock-out tournament for English football clubs in League One and League Two, the third and fourth tiers of the English football.
Split into simpler sentences: The 2015--16 Football League Trophy is the 32nd season in the history of the competition. It is a knock-out tournament for English football clubs in League One and League Two, the third and fourth tiers of the English football.