§ 02 · King James Bible
John 21:7
Therefore that disciple whom Jesus loved saith unto Peter, It is the Lord. Now when Simon Peter heard that it was the Lord, he girt his fisher’s coat unto him, (for he was naked,) and did cast himself into the sea.
Simple English
So, the disciple that Jesus loved told Peter, "It's the Lord." When Peter heard this, he put on his fishing coat and jumped into the sea to swim to Jesus.
* Work in progress - there may be occasional inaccuracies