The new plan involves a Legacy Commission to investigate Troubles-related killings, a separate information recovery body, and a dedicated legacy unit within An Garda SÃochána (Irish police).
A package of protections for veterans has also been proposed by the UK government.
But some MPs, including Northern Ireland MPs, have said the measures do not go far enough and want to amend the bill to include stronger protections in law.
In a written ministerial statement on Wednesday, the Northern Ireland secretary said the government had been “consulting widely” on the legislation.
Benn said the “result of these deliberations is that the government will bring forward a substantial package of amendments designed to improve the process for victims and families”.
He added they would “further safeguard our Operation Banner veterans and ensure oversight of their protections, and clearly differentiate between the role played during the Troubles by our brave security forces and the actions of paramilitary terrorists”.
Benn continued: “Owing to the time it has taken to ensure we get the amendments right, and the clear need for the House to have longer to scrutinise them, the bill will now return to the House early in the next session.”