( ( On ( the ( other hand ) ) ) ( , ( there ( ( are ( ( several elements ) ( that ( ( are ( more easily ) ) ( seen ( from ( a wheelchair ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN On) (NP (DT the) (JJ other) (NN hand))) (, ,) (NP (EX there)) (VP (VBP are) (NP (NP (JJ several) (NNS elements)) (SBAR (WHNP (WDT that)) (S (VP (VBP are) (ADVP (RBR more) (RB easily)) (VP (VBN seen) (PP (IN from) (NP (DT a) (NN wheelchair))))))))) (. .)))
On the other hand, there are several elements that are more easily seen from a wheelchair.
(ROOT (S (NP (JJ Reactive) (NNS elements)) (VP (VBP are) (ADJP (JJ able) (S (VP (TO to) (VP (VB combine) (ADVP (RBR more) (RB easily)) (PP (IN with) (NP (JJ other) (NNS elements)))))))) (. .)))