The legislature was literally divided, with some lawmakers convening at the state capitol while others gathered in a town hundreds of miles away designated by the governor. As a result, not enough votes were cast to reach the three-quarter threshold needed to overturn vetoes by the governor that would spark deep cuts to education and other services.

划线的长难句中，

问题1：“ not enough votes were cast ” 作为主干，它自身是主谓宾结构还是主系表结构？为什么？

问题2：“that would spark deep cuts to education and other services.”  这个从句修饰的是votes还是前面的主干？这个从句作什么成分？为什么？