Complex sentence: Following eleven seasons in the second-tier Football League Championship without any significant success, Coventry were relegated to Football League One in 2012, the first time in 48 years that the club were destined to play in the English league system's third tier.
Split into simpler sentences: Following eleven seasons in the second-tier Football League Championship without any significant success, Coventry were relegated to Football League One in 2012. Significantly, it was the first time in 48 years that the club were destined to play in the English league system's third tier.