The osprey, bald eagle and great blue heron have numerous nesting sites which can be easily viewed along this route.
(The osprey, bald eagle and great blue heron; have; numerous nesting sites which can be easily viewed along this route) (numerous nesting sites; can be easily viewed; L:along this route)
The osprey, bald eagle and great blue heron numerous nesting sites
have can be easily viewed
numerous nesting sites which can be easily viewed along this route
L:along this route