( They ( ( are ( ( divided ( into ( animals ( with ( a ( vertebral ( column ( or ( ( backbone and ) animals ) ) ) ) ) ) ) ) ) ( without one ) ) ) . ) )
(ROOT (S (NP (PRP They)) (VP (VBP are) (VP (VBN divided) (PP (IN into) (NP (NP (NNS animals)) (PP (IN with) (NP (DT a) (JJ vertebral) (NN column) (CC or) (NN backbone) (CC and) (NNS animals))))) (PP (IN without) (NP (CD one))))) (. .)))
They are divided into animals with a vertebral column or backbone and animals without one.
(ROOT (S (NP (NNP Backbone)) (VP (VBZ is) (NP (NP (DT another) (NN name)) (PP (IN for) (NP (DT the) (JJ vertebral) (NN column))))) (. .)))
Backbone is another name for the vertebral column.