( ( ( ( ( ( ( ( The surface ) ( of ( the Earth ) ) ) ( was hot ) ) , ) ( ( the atmosphere ) ( thick ( with ( poisonous gases ) ) ) ) ) and ) ( ( the Sun ) ( ( was fiercer ) ( than ( it ( is today ) ) ) ) ) ) . )
(ROOT (S (S (NP (NP (DT The) (NN surface)) (PP (IN of) (NP (DT the) (NN Earth)))) (VP (VBD was) (ADJP (JJ hot)))) (, ,) (S (NP (DT the) (NN atmosphere)) (ADJP (JJ thick) (PP (IN with) (NP (JJ poisonous) (NNS gases))))) (CC and) (S (NP (DT the) (NNP Sun)) (VP (VBD was) (ADJP (JJ fiercer)) (SBAR (IN than) (S (NP (PRP it)) (VP (VBZ is) (NP (NN today))))))) (. .)))
The surface of the Earth was hot, the atmosphere thick with poisonous gases and the Sun was fiercer than it is today.
(ROOT (S (NP (NP (DT The) (NN surface)) (PP (IN of) (NP (DT the) (NN sun)))) (VP (VBZ is) (ADJP (RB much) (JJ hotter) (PP (IN than) (NP (NP (RB almost) (NN anything)) (PP (IN on) (NP (NN earth))))))) (. .)))