when I was a young girl,all I ever wanted to do was travel,and I decided that the best way to do

when I was a young girl,时间状语从句
all I ever wanted to do 主语从句
and 并列另一个分句
I decided 主谓
that the best way to do this was to become a flight attendant.宾语从句 其中,the best way to do this 是从句的主语 was to become 谓语 a flight attendant 宾语