( However ( , ( they ( ( ( ( ( work well ) ( on Earth ) ) , ) ( even ( though ( ( the Earth ) ( is ( ( rotating , ) ( ( turning ( around ( ( it 's ) axis ) ) ) ( once ( a day ) ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (ADVP (RB However)) (, ,) (NP (PRP they)) (VP (VBP work) (ADVP (RB well)) (PP (IN on) (NP (NNP Earth))) (, ,) (SBAR (RB even) (IN though) (S (NP (DT the) (NN Earth)) (VP (VBZ is) (NP (NP (VBG rotating)) (, ,) (S (VP (VBG turning) (PP (IN around) (NP (NP (PRP it) (POS 's)) (NNS axis))) (NP (ADVP (RB once)) (DT a) (NN day))))))))) (. .)))
However, they work well on Earth, even though the Earth is rotating, turning around it's axis once a day.
(ROOT (S (NP (NNP Earth)) (VP (VBZ rotates) (PP (PP (IN on) (NP (PRP$ its) (NNS axis)) (ADVP (RB once))) (CC times) (PP (IN in) (NP (CD one) (NN day))))) (. .)))