Question

◢͟￨⁴⁶

この3行の言いたいことがわかりません。
また、3語目のwhatの役割も教えてください。

end(It was what lay in wait for Gatsby, what foul dust followed
on the heels of his dreams that, for a while, ended my interest
n
in the failed sorrows and short-lived joys of men.