( ( ( ( ( Cardiac muscle ) ( is ( ( ( ( similar ( to ( ( skeletal muscle ) ( ( in that ) ( it ( is ( ( striated and ) multinucleate ) ) ) ) ) ) ) , ) and ) ( similar ( to ( ( smooth muscle ) ( ( in that ) ( ( the nuclei ) ( are ( centrally located ) ) ) ) ) ) ) ) ) ) and ) ( ( many cells ) ( are ( required ( to ( span ( ( the length ) ( of ( the muscle ) ) ) ) ) ) ) ) ) . )
(ROOT (S (S (NP (NNP Cardiac) (NN muscle)) (VP (VBZ is) (ADJP (ADJP (JJ similar) (PP (TO to) (NP (NP (JJ skeletal) (NN muscle)) (SBAR (WHPP (IN in) (WHNP (WDT that))) (S (NP (PRP it)) (VP (VBZ is) (ADJP (JJ striated) (CC and) (JJ multinucleate)))))))) (, ,) (CC and) (ADJP (JJ similar) (PP (TO to) (NP (NP (JJ smooth) (NN muscle)) (SBAR (WHPP (IN in) (WHNP (WDT that))) (S (NP (DT the) (NNS nuclei)) (VP (VBP are) (ADJP (RB centrally) (VBN located))))))))))) (CC and) (S (NP (JJ many) (NNS cells)) (VP (VBP are) (VP (VBN required) (S (VP (TO to) (VP (VB span) (NP (NP (DT the) (NN length)) (PP (IN of) (NP (DT the) (NN muscle)))))))))) (. .)))
Cardiac muscle is  similar to skeletal muscle in that it is striated and multinucleate, and similar to smooth muscle in that the nuclei are centrally located and many cells are required to span the length of the muscle.
(ROOT (S (PP (IN Like) (NP (JJ skeletal) (NN muscle))) (, ,) (NP (JJ cardiac) (NN muscle)) (VP (VBZ is) (VP (VBN striated))) (. .)))