He walked out into the street and I followed.
( ( ( ( He ( ( walked out ) ( into ( the street ) ) ) ) and ) ( I followed ) ) . )
(ROOT (S (S (NP (PRP He)) (VP (VBD walked) (PRT (RP out)) (PP (IN into) (NP (DT the) (NN street))))) (CC and) (S (NP (PRP I)) (VP (VBD followed))) (. .)))
I followed him as he walked.
( I ( ( ( followed him ) ( as ( he walked ) ) ) . ) )
(ROOT (S (NP (PRP I)) (VP (VBD followed) (NP (PRP him)) (SBAR (IN as) (S (NP (PRP he)) (VP (VBD walked))))) (. .)))