I was old enough at the time that I knew what was going on.
( I ( ( was ( ( ( old enough ) ( at ( the time ) ) ) ( that ( I ( knew ( what ( was ( going on ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP I)) (VP (VBD was) (ADJP (ADJP (JJ old) (RB enough) (PP (IN at) (NP (DT the) (NN time)))) (SBAR (IN that) (S (NP (PRP I)) (VP (VBD knew) (SBAR (WHNP (WP what)) (S (VP (VBD was) (VP (VBG going) (PRT (RP on))))))))))) (. .)))
I was old enough to know that Santa was actually my parents.
( I ( ( was ( ( old enough ) ( to ( know ( that ( Santa ( ( was actually ) ( my parents ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP I)) (VP (VBD was) (ADJP (JJ old) (RB enough) (S (VP (TO to) (VP (VB know) (SBAR (IN that) (S (NP (NNP Santa)) (VP (VBD was) (ADVP (RB actually)) (NP (PRP$ my) (NNS parents)))))))))) (. .)))