Page Combining define as merge pages into single page. If you mean page combining like page linking for example you have 5 blogs and on each blog you have links to another 4 blogs then it has no effect on SEO it will increase your traffic with interlinking.This my opinion, Share Your opinion.
[h=2]Condensed Version: How to Combine two Fan pages or change a Fan page name[/h] If you just want to combine two pages or change the name or URL of your existing fan page, follow these instructions: Get yourself a place page: It's simple, but you must do it from a mobile device. Claim your place page: You must follow the verification process, but it shouldn't take too long Create your new fan page: If you haven't done it already, create your new fan page with your desired new name. You can set the vanity URL later. If you already have created the new page or just want to combine two Facebook pages, skip this step. Merge your place with your old page: Click the "merge with existing page" link on the bottom left of your place page, then select your old page. Your place page will assume the fans, feed, and URL of your old page. Merge your combined page with your new page: Click the "merge with existing page" link on the bottom left of your combined place/fan page again, and this time select your new page. You should now have a single page, combined from a place page and two fan pages. You'll have the vanity URL of the newest fan page with the fans of all three. Enjoy!