His heels clicked together.
( ( His heels ) ( ( clicked together ) . ) )
(ROOT (S (NP (PRP$ His) (NNS heels)) (VP (VBD clicked) (ADVP (RB together))) (. .)))
He clicked his heels together for some reason.
( He ( ( ( ( clicked ( his heels ) ) together ) ( for ( some reason ) ) ) . ) )
(ROOT (S (NP (PRP He)) (VP (VBD clicked) (NP (PRP$ his) (NNS heels)) (ADVP (RB together)) (PP (IN for) (NP (DT some) (NN reason)))) (. .)))