Complex sentence: Wigan are the only club to have won the Championship more than 2 seasons consecutively., with an unprecedented 7 seasons in succession from 1989/90 to 1995/96.
Split into simpler sentences: Wigan are the only club to have won the Championship more than 2 seasons consecutively. Wigan won the Championship an unprecedented 7 seasons in succession from 1989/90 to 1995/96.