# my chains in Christ came to light

"It became known that I am in prison for the sake of Christ" 

# my chains in Christ came to light throughout the whole palace guard and to everyone else

"the palace guards and many other people in Rome know that I am in chains for the sake of Christ" 

# my chains in Christ

"my chains for the sake of Christ" or "my chains because I teach people about Christ"

# palace guard

This was a group of soldiers that helped protect the Roman emperor.