multisite network how to display blog post

We are setting up a multi site network.. i have one question.. sorry if its an obvious one but i don't know if that is actually possible.
we have one main website.. and then have few multisite blogs.. we want to display posts from those network sites on to our main website or inside the pages..
for example.. main site is about sports.. and multisites are football, cricket and tennis..
is it possible for us to display posts from 3 sub sites onto the main site without having to duplicate them on the main website?
p.s. we are using avada theme from theme-fusion so we would like to display relevant posts from sub sites on the posts from main website... but not sure how to do it.
any help would be appreciated.