I can't see the structure of this sentence.
What is the subject of the second sentence? I can't understand the structure of it. Could you please help?
"I expect a miracle to happen, then and there, and a miracle did take place. But, as so often happens with a major change, it came about over a period of time."-----'As so often happens with...' I understand that the 'happens' is the verb, then what is the subject?