本句子主干为主系表句型,状语：With this approach,主语：the space （定语：for actions and behavioral alternatives）,系动词：become,表语：explicit.破折号后面的内容补充解释主句,中心词为step（定语：for sustainable urban planning ）, 后面的句子为定语从句（which calls for innovative strategies to adapt to these uncertain and rapid changes.）,先行词为step（定语从句中做主语）,定语从句中谓语是calls for,宾语是innovative strategies,宾语补足语是to adapt to these uncertain and rapid changes.