Most early Americans were farmers.简单句（只有一个主谓结构）
主语 系 表
As people moved inland,they continued to hunt and farm and supply most of their own needs.复合句
As 引导的时间状语从句,如果有逗号,通常是复合句.
However,there were some things they could not produce themselves; for these they relied on traveling peddlers.并列复合句.they could not produce themselves是定语从句,修饰前面的名词some things ,名词后面有个完整句子时,该句多半是定语从句.for又连起前后两个并列句.
Peddlers brought pots and pans,scissors,ribbons and lace,spices
主语 谓语 宾语
and medicines.简单句