# I sent

Here "I" refers to Moses.

# wilderness of Kedemoth

This is the name of a place near the valley of Arnon. 

# Sihon ... Heshbon

These are the names of a man and a place. See how you translated them in Deuteronomy 1:4.

# with words of peace

"with my offer of peace" or "with a message from me asking for peace"