Charon is unusual in that it is the largest moon with respect to its primary planet in the solar system (a distinction once held by Earth's moon).
(Charon; is; unusual) (it; is; the largest moon with respect to its primary planet in the solar system) (a distinction; held; by Earth's moon; T:once)
Charon it a distinction
is is held
unusual
the largest moon with respect to its primary planet in the solar system
by Earth's moon T:once