"things fall apart" chinua achebe socratic seminar

have to answer the question below and ask two. please help.

"title: the title of the novel is derived from the william butler yeats poem entitled 'the second coming,' concerned with the second coming of christ. the completed line reads: 'things fall apart; the centre cannot hold.' what layers of meaning are discernible when this completed line is applied to the story?"
so basically need the answer for that and then two more questions to ask my class. i will give brainliest just need help with these by tomorrow