( ( ( Remind ( the students ) ) ( that ( ( ( there ( ( was often ) ( ( a ( ( very long ) distance ) ) ( between ( ( ( the ( mountain stream ) ) and ) ( the city ) ) ) ) ) ) and ) ( sometimes ( there ( was ( ( a ( ( valley or ) hill ) ) ( in between ) ) ) ) ) ) ) ) . )
(ROOT (S (VP (VB Remind) (NP (DT the) (NNS students)) (SBAR (IN that) (S (S (NP (EX there)) (VP (VBD was) (ADVP (RB often)) (NP (NP (DT a) (ADJP (RB very) (JJ long)) (NN distance)) (PP (IN between) (NP (NP (DT the) (NN mountain) (NN stream)) (CC and) (NP (DT the) (NN city))))))) (CC and) (S (ADVP (RB sometimes)) (NP (EX there)) (VP (VBD was) (NP (NP (DT a) (NN valley) (CC or) (NN hill)) (PP (IN in) (NP (IN between))))))))) (. .)))
Remind the students that there was often a very long distance between the mountain stream and the city and sometimes there was a valley or hill in between.
(ROOT (S (NP (NNS Streams)) (ADVP (RB often)) (VP (VBP start) (PP (IN in) (NP (NNS mountains)))) (. .)))