Complex sentence: Further to the right, a company of BMIX whose objective was the head of Vaiercaout, met with strong resistance from the enemy, forcing them to remain clinging on a slope and not reaching the top of this spur.
Split into simpler sentences: Further to the right, a company of BMIX whose objective was the head of Vaiercaout, met with strong resistance from the enemy. Which forced them to remain clinging on a slope and not reaching the top of this spur.