( However ( , ( they ( ( ( ( ( work well ) ( on Earth ) ) , ) ( even ( though ( ( the Earth ) ( is ( ( rotating , ) ( ( turning ( around ( its 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 (PRP$ its) (NNS axis))) (NP (ADVP (RB once)) (DT a) (NN day))))))))) (. .)))
However, they work well on Earth, even though the Earth is rotating, turning around its 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))))) (. .)))