As soon as he opens the gate from the outside,he comes into

你学习真认真哦!
不是固定搭配.
这里的断句应该是：
As soon as he 【opens the gate 】/【from the outside 介词短语】,he comes into the garden and waits
句子意思：
他刚一从外面打开门,就进入园子并等待着.
祝你开心如意!