Complex sentence: A letter from James, received on 16 March, contained a threat to punish all who rebelled against him and declaring the assembly illegal, resulted in his followers to abandon the Convention, leaving the Williamites dominant.
Split into simpler sentences: A letter from James, received on 16 March, contained a threat to punish all who rebelled against him and declaring the assembly illegal. This resulted in his followers abandoning the Convention, leaving the Williamites dominant.