这句话语法错误在哪里?

问题描述:

这句话语法错误在哪里?
Leslie Marmon Silko has said that her writing,which was powerfully influenced by storytellers in her family but that the landscape of her childhood also shaped her vision and provided stories.
我看Which 从句也有谓语,貌似结构很完整,问题出在哪儿了呢?

her writing 是从句中的主语,which到family都是对writing的修饰,句意上来说but后是另一个分句,那her writing 这一句就无谓宾..