( They ( ( are ( ( ( two magnets ) , ) ( ( attracted ( to ( each other ) ) ) ( by ( irresistible force ) ) ) ) ) ... ) )
(ROOT (S (NP (PRP They)) (VP (VBP are) (NP (NP (CD two) (NNS magnets)) (, ,) (VP (VBN attracted) (PP (TO to) (NP (DT each) (JJ other))) (PP (IN by) (NP (JJ irresistible) (NN force)))))) (: ...)))
They are two magnets, attracted to each other by irresistible force....
(ROOT (S (S (VP (VBG Increasing) (NP (NP (DT the) (NN distance)) (PP (IN between) (NP (DT the) (CD two) (NNS magnets)))))) (VP (MD will) (VP (VB cause) (NP (DT a) (NN decrease)) (PP (IN in) (NP (NP (DT the) (NN force)) (PP (IN of) (NP (NP (NN attraction)) (PP (IN between) (NP (CD two) (NNS magnets))))))))) (. .)))
Increasing the distance between the two magnets will cause a decrease in the force of attraction between two magnets.