Complex sentence: At the CRNC, Abramoff developed political alliances with College Republican chapter presidents across the nation, many who would later hold key roles in state and national politics and business, and some who would later interact with Abramoff as a lobbyist.
Split into simpler sentences: At the CRNC, Abramoff developed political alliances with College Republican chapter presidents across the nation. Many would later hold key roles in state and national politics and business, and some would later interact with Abramoff in his role as a lobbyist.