Complex sentence: The Cobras went winless in the 1986,1989 and 1990 seasons; during 1989, they won against the Sunshine Crows, but when the Crows resigned from the competition, their record was expunged, leaving Camberwell winless.
Split into simpler sentences: The Cobras went winless in the 1986,1989 and 1990 seasons. During 1989 they had won against the Sunshine Crows, but when the Crows resigned from the competition their record was deleted, leaving Camberwell winless.