Complex sentence: Kodansha recently announced that volume 43 of the tankouban series would also include a second OAD for the anime series, which will be bundled with the manga release.
Split into simpler sentences: Kodansha recently announced that they were producing a second OAD for the anime series. Volume 43 of the tankouban series will include this new OAD for the anime series, and that it will be bundled with the manga release.