Turns out that Bill got one letter last year that just tore at his heartstrings.
( ( ( Turns out ) ( that ( Bill ( ( ( got ( one letter ) ) ( last year ) ) ( that ( just ( tore ( at ( his heartstrings ) ) ) ) ) ) ) ) ) . )
(ROOT (S (VP (VBZ Turns) (PRT (RP out)) (SBAR (IN that) (S (NP (NNP Bill)) (VP (VBD got) (NP (CD one) (NN letter)) (NP (JJ last) (NN year)) (SBAR (IN that) (S (ADVP (RB just)) (VP (VBD tore) (PP (IN at) (NP (PRP$ his) (NNS heartstrings)))))))))) (. .)))
Bill got one letter last year that tore at his heartstrings.
( Bill ( ( ( ( got ( one letter ) ) ( last year ) ) ( that ( tore ( at ( his heartstrings ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Bill)) (VP (VBD got) (NP (CD one) (NN letter)) (NP (JJ last) (NN year)) (SBAR (IN that) (S (VP (VBD tore) (PP (IN at) (NP (PRP$ his) (NNS heartstrings))))))) (. .)))