Complex sentence: The United Nations and several of the contributing nations to UNAMSIL applied pressure on the British government to integrate its forces into UNAMSIL, but the MoD lacked faith in the competence of UNAMSIL headquarters and was unwilling to place its troops under UNAMSIL command.
Split into simpler sentences: The United Nations and several of the contributing nations to UNAMSIL applied pressure on the British government to integrate its forces into UNAMSIL. However, the MoD lacked faith in the competence of UNAMSIL headquarters and was unwilling to place its troops under UNAMSIL command.