By the use of a low-powered magnifying glass, however, the cluster fly is easily distinguishable from the house fly as it has a downy coat of yellow hairs upon its back and sides.
(the cluster fly; is; easily distinguishable from the house fly) (it; has; a downy coat of yellow hairs)
the cluster fly it
is has
easily distinguishable from the house fly
a downy coat of yellow hairs