They need to develop the ability to observe stimuli or properties of objects and to use their senses in more sophisticated ways;
(They; need; to develop the ability) Context(They need,List([0, 9))):(They; need to develop; the ability to observe stimuli or properties of objects and to use their senses in more sophisticated ways)
They need,List([0, 9))
They They
need need to develop
to develop the ability
the ability to observe stimuli or properties of objects and to use their senses in more sophisticated ways