What is the difference between a complex character and a limited character?

The biggest difference between round and flat characters is the character's complexity: round characters have layers, while flat characters do not. These layers cause the round characters to be more interesting, meaning audiences can more easily sympathize with round characters than with flat ones

Explanation:

Round is also called complex character. They call it round because it has more personality and traits than the limited or flat character.

in "letter from a birmingham jail," king argues that there are four basic steps in any nonviolent campaign: "[c]ollection of the facts to determine whether injustices exist; negotiation; self purification; and direct action." finally, direct action is taken and acts such as boycotts and sit-ins are staged.