That's because the Columbia Slough used to be a wetland and riparian habitat where bird, fish and game were abundant.
(That; 's; because the Columbia Slough used to be a wetland and riparian habitat) (the Columbia Slough; to be; a wetland and riparian habitat) (bird, fish and game; were; abundant)
That the Columbia Slough bird, fish and game
's to be were
because the Columbia Slough used to be a wetland and riparian habitat
a wetland and riparian habitat
abundant