( ( ( ( MARS Mars ) , ) ( otherwise ( known ( as ( the ( Red Planet ) ) ) ) ) ) ( ( ( is ( the ( fourth planet ) ) ) ( away ( from ( the sun ) ) ) ) . ) )
(ROOT (S (NP (NP (NNP MARS) (NNP Mars)) (, ,) (VP (ADVP (RB otherwise)) (VBN known) (PP (IN as) (NP (DT the) (NNP Red) (NN Planet))))) (VP (VBZ is) (NP (DT the) (JJ fourth) (NN planet)) (ADVP (RB away) (PP (IN from) (NP (DT the) (NN sun))))) (. .)))
MARS Mars, otherwise known as the Red Planet is the fourth planet away from the sun.
(ROOT (S (NP (NNP Mars)) (VP (VBZ is) (NP (NP (DT the) (JJ fourth) (NN planet)) (PP (IN from) (NP (DT the) (NN sun))))) (. .)))