The second group of shepherding dogs is made up of the very well known protectors, the mastiffs, entrusted with defending the domestic animals from the attacks of the predators.
(The second group of shepherding dogs; is made up; ) (the mastiffs; entrusted; with defending the domestic animals from the attacks of the predators)
The second group of shepherding dogs the mastiffs
is made up entrusted
with defending the domestic animals from the attacks of the predators