阅读有句子不明白

小皮球PAL

By the mid-1960s, the situation took an alarming turn with the break of four more new pests, necessitating pesticide spraying to such an extent that 50%of the financial outlay on cotton prodution was accounted for by pesticides.
红色这段话是倒桩了吗？WAS ACCOUNTED FOR正确的语法是应该在THAT后面？
necessitating pesticide spraying to such an extent was accounted for 50%of the financial outlay on cotton prodution。
如果是，这是什么语法现象？