( ( ( ( ( ( At first ) ( , ( it ( tried ( to ( ( sell it ) ( ( ( to ( carmakers ( for windshields ) ) ) and ) ( to ( ( eyeglass makers ) ( for lenses ) ) ) ) ) ) ) ) ) ) , ) but ) ( it ( ( was ( too expensive ) ) ( for ( either use ) ) ) ) ) . )
(ROOT (S (S (PP (IN At) (NP (JJ first))) (, ,) (NP (PRP it)) (VP (VBD tried) (S (VP (TO to) (VP (VB sell) (NP (PRP it)) (PP (PP (TO to) (NP (NP (NNS carmakers)) (PP (IN for) (NP (NNS windshields))))) (CC and) (PP (TO to) (NP (NP (JJ eyeglass) (NNS makers)) (PP (IN for) (NP (NNS lenses))))))))))) (, ,) (CC but) (S (NP (PRP it)) (VP (VBD was) (ADJP (RB too) (JJ expensive)) (PP (IN for) (NP (DT either) (NN use))))) (. .)))
At first, it tried to sell it to carmakers for windshields and to eyeglass makers for lenses, but it was too expensive for either use.
(ROOT (S (NP (NNS Microscopes)) (VP (VBD were) (ADVP (RB first)) (VP (VBN developed) (PP (IN in) (NP (DT the) (JJ early) (NN 1600s))) (PP (IN by) (NP (JJ eyeglass) (NNS makers))))) (. .)))