What were the two main compromises of the constitutional convention and how did they affect the government

The two main compromises were the Great Compromise and the 3/5 Compromise. 

The Great Compromise created a bicameral legislature. It created the House of Representatives, in which the representation of the states depended on their population, and the Senate, in which each state had an equal number of representatives.

The 3/5 Compromise stated that slaves would be counted as 3/5 of a person.