( Students ( ( will ( observe ( ( simple ( or ( compound machines ) ) ) ( located ( ( ( at home ) or ) ( at school ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Students)) (VP (MD will) (VP (VB observe) (NP (NP (JJ simple) (CC or) (JJ compound) (NNS machines)) (VP (VBN located) (PP (PP (IN at) (NP (NN home))) (CC or) (PP (IN at) (NP (NN school)))))))) (. .)))
Students will observe simple or compound machines located at home or at school.
(ROOT (S (NP (NNS Scissors)) (VP (VBP are) (NP (JJ compound) (NNS machines))) (. .)))