英语语法提问2They are made from a variety of materials,such as way

那个“such as way and glass”是插入语,可以拿掉而不影响语法结构,这样句子就变成了
They are made from a variety of materials so skillfully that they can scarcely be distinguished from natural flowers.
所以 skillfully 是句中的状语,修饰谓语 be made from... .就是说,这些东西由大量的材料“精心”制成.

修饰动词made,你可以将句子简化为they are made so skillfully that .......

skillfully是修饰made这个动词的，意思是“精确或巧夺天工般制作”，但因为句中用了so...that（如此...以至于），所以将其后置

做假花的手艺
artificial flowers are made from a variety of materials, such as way and glass, (it's made) so skillfully that they can ......