Complex sentence: The party emerged around the supporters of Ruairí Ó Brádaigh and Dáithí Ó Conaill, who as Irish republican legitimists, rejected the reformism of Gerry Adams and other members of Sinn Féin who supported abandoning the policy of abstentionism.
Split into simpler sentences: The party emerged around the supporters of Ruairí Ó Brádaigh and Dáithí Ó Conaill. As Irish republican legitimists, they rejected the reformism of Gerry Adams and other members of Sinn Féin who supported abandoning the policy of abstentionism.