Forward RSS Feeds

Is there a way to forward two of my wordpress blog feeds, to my main feed, without using yahoo pipes, or services like that? I have tried them and they seem to grab my posts when I do the “preview” function, which can get annoying.

Some of the plugins put my posts from the other feeds, on my main site, which I don’t want either since I made separate domains to keep that content separate. (My goal is to make it easier for my users to have the information)

Essentially I want: (https://www.jcoreydavis.com/comics/?feed=rss2) + (https://www.jcoreydavis.com/blog/?feed=rss2) –> (https://www.jcoreydavis.com/?feed=rss2)