The river-beds are mostly too shallow for anything but flat-bottomed boats.
( ( The river-beds ) ( ( ( are mostly ) ( too ( shallow ( for ( anything ( but ( flat-bottomed boats ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NNS river-beds)) (VP (VBP are) (ADVP (RB mostly)) (ADJP (RB too) (JJ shallow) (PP (IN for) (NP (NP (NN anything)) (PP (CC but) (NP (JJ flat-bottomed) (NNS boats))))))) (. .)))
Boats that are not flat-bottomed are illegal on the river.
( ( Boats ( that ( ( are not ) flat-bottomed ) ) ) ( ( are ( illegal ( on ( the river ) ) ) ) . ) )
(ROOT (S (NP (NP (NNS Boats)) (SBAR (WHNP (WDT that)) (S (VP (VBP are) (RB not) (ADJP (JJ flat-bottomed)))))) (VP (VBP are) (ADJP (JJ illegal) (PP (IN on) (NP (DT the) (NN river))))) (. .)))