Complex sentence: HMC's new owners opted to retain its longtime Secaucus, NJ offices in the very same building after the sale, and is now part of the regular tenant roster of Hartz Mountain Industries (HMI).
Split into simpler sentences: HMC's new owners opted to retain its longtime Secaucus, NJ offices in the very same building after the sale. HMC is now considered part of the regular tenant roster of Hartz Mountain Industries (HMI).