en_tn/luk/05/12.md

behold a man full of leprosy was there

The word "behold" alerts us to a new person in the story. Your language may have a way of doing this. English uses "There was a man who was full of leprosy."

he fell on his face

"he bowed down to the ground" (UDB) or "he knelt and touched the ground with his face"

implored him

"begged him" or "pleaded with him" (UDB)

if you are willing

"if you want to"