Display specific data from external website

Display specific data from external website

Let's say this is the external website:
title
header
banner
content1
content2
footer
Now I want to know how to copy a specific part of the external website and
paste it on my own like this:
my title
my header
my banner
my content
external content2
my footer
I only want to get the html code so I can make my own stylesheet for
external content2
I hope this is clear enough.
I've tried using phps file_get_html()