The bottom sediment supports many insect larvae, which are food for Arctic char and insect-eating birds.
(The bottom sediment; supports; many insect larvae, which are food for Arctic char and insect-eating birds) (many insect larvae; are; food for Arctic char and insect-eating birds)
The bottom sediment many insect larvae
supports are
many insect larvae, which are food for Arctic char and insect-eating birds
food for Arctic char and insect-eating birds