Question

帮我分析下这长难句

Manufacturers of products that claim to be environmentally friendly will face tighter rules on how they are advertised to consumers under changes proposed by the Federal Trade Commission.

Answer 1

Manufacturers of products that claim to be environmentally friendly
will face tighter rules
on how they are advertised to consumers under changes proposed by the Federal Trade Commission.
主干 manufacturers will face tighter rules
claim....... friendly 是修饰 manufactures
on how they .........Commission 修饰 tighter rules

追问

那个为什么是on how？