Daniel took it upon himself to explain a few things.
( Daniel ( ( ( ( took it ) ( upon himself ) ) ( to ( explain ( a ( few things ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Daniel)) (VP (VBD took) (NP (PRP it)) (PP (IN upon) (NP (PRP himself))) (S (VP (TO to) (VP (VB explain) (NP (DT a) (JJ few) (NNS things)))))) (. .)))
Daniel explained what was happening.
( Daniel ( ( explained ( what ( was happening ) ) ) . ) )
(ROOT (S (NP (NNP Daniel)) (VP (VBD explained) (SBAR (WHNP (WP what)) (S (VP (VBD was) (VP (VBG happening)))))) (. .)))