Complex sentence: While Muhammad was at Hamra Al Asad, he made an agreement with Mabad al-Khuzaah at Tihamah in which Mabad pledged not to conceal anything from him.
Split into simpler sentences: While Muhammad was at Hamra al-Asad, he made an agreement with Mabad al-Khuzaah at Tihamah. They made a compact with Muhammad to not to conceal anything from him.