Sin entered the world because one man sinned. And death came because of sin. Everyone sinned, so death came to all people.
References for Romans 5:12
Before the law was given, sin was in the world. But sin is not judged when there is no law.
Death ruled from the time of Adam to the time of Moses. Death ruled even over those who did not sin as Adam did. He broke God's command. But he also became a pattern of the One who was going to come.
God's gift is different from Adam's sin. Many people died because of the sin of that one man. But it was even more sure that God's grace would also come through one man. That man is Jesus Christ. God's gift of grace was more than enough for the whole world.
The result of God's gift is different from the result of Adam's sin. God judged one sin. That brought guilt. But after many sins, God's gift made people right with him.
One man sinned, and death ruled because of his sin. But we are even more sure of what will happen because of what the one man, Jesus Christ, has done. Those who receive the rich supply of God's grace will rule with Christ in his kingdom. They have received God's gift and have been made right with him.
One man's sin brought guilt to all people. So also one right act made all people right with God. And all who are right with God will live.
Many people were made sinners because one man did not obey. But one man did obey. That is why many people will be made right with God.
The law was given so that sin would increase. But where sin increased, God's grace increased even more.
Sin ruled because of death. So also grace rules in the lives of those who are right with God. The grace of God brings eternal life because of what Jesus Christ our Lord has done.