; (E) allow unfettered humanitarian access by United Nations organizations and specialized agencies and domestic and international humanitarian organizations to civilian populations in conflict-affected areas; (F) cooperate with the United Nations High Commissioner for Refugees and organizations affiliated with the United Nations to allow for the protection of displaced persons and the safe, voluntary, sustainable, and dignified return of refugees and internally displaced persons; and (G) take constructive steps to investigate all reports of unlawful recruitment of children by Sudanese security forces and prosecute those found to be responsible. (2) Form The certification described in subsection (a) containing the conditions described in paragraph (1) shall be submitted in unclassified form but may include a classified annex. (d) Sunset This section shall terminate on the date that is the earlier of— (1) the date that is two years after the date of the enactment of this Act; or (2) the date on which the President determines that a successful rotation of military to civilian leadership in the Sovereignty Council has occurred. 12. Authorization of imposition of sanctions with respect to certain Government of Sudan officials and other individuals (a) In general The President shall impose the sanctions described in subsection (b) with respect to any senior official of the Government of Sudan and any other foreign person that the President determines, on or after the date of enactment of this Act— (1) is knowingly responsible for, complicit in, or has directly or indirectly engaged in— (A) significant actions or policies that threaten the peace, security, or stability of Sudan, including through the use of armed groups; (B) significant actions or policies that obstruct, undermine, delay, or impede, or pose a significant risk of obstructing, undermining, delaying, or impeding, the civil and political rights of the Sudanese people and the political transition in Sudan