Complex sentence: As the primary effort of the ARBiH offensive bogged down the same day, Kupres became the main objective and the 317th Mountain Infantry Brigade was added to augment the ARBiH force that made initial advances towards Kupres.
Split into simpler sentences: As the primary effort of the ARBiH offensive bogged down the same day, Kupres became the main objective. The 317th Mountain Infantry Brigade was added to augment the ARBiH force that made initial advances towards Kupres.