# If Satan is divided against himself

"Satan" here refers to the demons who follow Satan as well as to Satan himself. Alternate translation: "If Satan and members of his kingdom are fighting among themselves" 

# how will his kingdom stand?

This question can be translated as a statement. Alternate translation: "his kingdom will not last." or "his kingdom will fall apart." 

# For you say I cast out demons by Beelzebul

"For you say that it is by the power of Beelzebul that I make demons leave people"