( However ( , ( ( because ( of ( ( several factors ) ( such ( as ( ( ( ( weather , ) ( instrument ( flight rules ) ) ) and ) ( air ( traffic complexity ) ) ) ) ) ) ) ) ( , ( ( the ( Self-separation capability ) ) ( ( involves ( ( other ( ( elements and ) aspects ) ) ( such ( as ( rules ( of ( ( ( ( ( ( ( the air ) , ) ( communication ( ( technologies and ) protocols ) ) ) , ) ( air ( traffic management ) ) ) and ) others ) ) ) ) ) ) ) . ) ) ) ) ) )
(ROOT (S (ADVP (RB However)) (, ,) (PP (RB because) (PP (IN of) (NP (NP (JJ several) (NNS factors)) (PP (JJ such) (IN as) (NP (NP (NN weather)) (, ,) (NP (NN instrument) (NN flight) (NNS rules)) (CC and) (NP (NN air) (NN traffic) (NN complexity))))))) (, ,) (NP (DT the) (JJ Self-separation) (NN capability)) (VP (VBZ involves) (NP (NP (JJ other) (NNS elements) (CC and) (NNS aspects)) (PP (JJ such) (IN as) (NP (NP (NNS rules)) (PP (IN of) (NP (NP (DT the) (NN air)) (, ,) (NP (NN communication) (NNS technologies) (CC and) (NNS protocols)) (, ,) (NP (NN air) (NN traffic) (NN management)) (CC and) (NP (NNS others)))))))) (. .)))
However, because of several factors such as weather, instrument flight rules and air traffic complexity, the Self-separation capability involves other elements and aspects such as rules of the air, communication technologies and protocols, air traffic management and others.
(ROOT (S (NP (NNP Air)) (VP (MD can) (VP (VB be) (VP (VBN separated) (PP (IN into) (NP (JJ several) (NNS elements)))))) (. .)))