( They ( ( ( ( ( were ( heated ( by ( coal stoves ) ) ) ) and ) most ) ( had electricity ) ) . ) )
(ROOT (S (NP (PRP They)) (VP (VP (VBD were) (VP (VBN heated) (PP (IN by) (NP (NN coal) (NNS stoves))))) (CC and) (ADVP (RBS most)) (VP (VBD had) (NP (NN electricity)))) (. .)))
They were heated by coal stoves and most had electricity.
(ROOT (S (NP (NNP Coal)) (VP (VBZ is) (NP (NP (DT the) (NN source)) (PP (IN of) (NP (JJS most) (NN electricity))))) (. .)))