( ( Such changes ) ( ( can ( be ( caused ( ( ( ( ( by ( ( relative movements ) ( of ( ( any ( of ( ( ( the ( optical components ) ) or ) ( the object ) ) ) ) itself ) ) ) ) , ) and ) also ) ( by ( ( local changes ) ( in air-temperature ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (JJ Such) (NNS changes)) (VP (MD can) (VP (VB be) (VP (VBN caused) (PP (PP (IN by) (NP (NP (JJ relative) (NNS movements)) (PP (IN of) (NP (NP (DT any)) (PP (IN of) (NP (NP (DT the) (JJ optical) (NNS components)) (CC or) (NP (DT the) (NN object)))) (ADVP (PRP itself)))))) (, ,) (CC and) (ADVP (RB also)) (PP (IN by) (NP (NP (JJ local) (NNS changes)) (PP (IN in) (NP (NN air-temperature))))))))) (. .)))
Such changes can be caused by relative movements of any of the optical components or the object itself, and also by local changes in air-temperature.
(ROOT (S (NP (NP (DT The) (NN movement)) (PP (IN of) (NP (NP (DT an) (NN air) (NN mass)) (PP (IN over) (NP (NP (NN earth) (POS 's)) (NN surface)))))) (VP (VBZ causes) (NP (JJ local) (NN weather) (NNS changes))) (. .)))