( ( These studies ) ( ( involved ( electrochemistry ( , ( electromagnetism ( , ( ( electricity and ) magnetism ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT These) (NNS studies)) (VP (VBD involved) (NP (NN electrochemistry) (, ,) (NN electromagnetism) (, ,) (NN electricity) (CC and) (NN magnetism))) (. .)))
These studies involved electrochemistry, electromagnetism, electricity and magnetism.
(ROOT (S (NP (NNP Electrochemistry)) (VP (VBZ is) (NP (NP (DT the) (NN study)) (PP (IN of) (NP (NP (DT the) (NN relationship)) (PP (IN between) (NP (NN electricity) (CC and) (NN chemical) (NNS reactions))))))) (. .)))