( ( Anything ( that ( ( is not ) ( empty space ) ) ) ) ( itself ( ( is ( comprised ( of ( these two ) ) ) ) . ) ) )
(ROOT (S (NP (NP (NN Anything)) (SBAR (WHNP (WDT that)) (S (VP (VBZ is) (RB not) (NP (JJ empty) (NN space)))))) (NP (PRP itself)) (VP (VBZ is) (VP (VBN comprised) (PP (IN of) (NP (DT these) (CD two))))) (. .)))
Anything that is not empty space itself is comprised of these two.
(ROOT (S (NP (DT The) (NN nucleus)) (VP (VBZ is) (VP (VBN comprised) (ADVP (RB primarily)) (PP (IN of) (NP (JJ empty) (NN space))))) (. .)))