# From the days of John the Baptist

"From the time John began preaching his message" 

# the kingdom of heaven suffers violence

This could mean 1) "enemies violently attack the kingdom of heaven" or 2) "the kingdom of heaven has been coming forcefully."

# and men of violence take it by force

This could mean 1) "and violent people forcefully take it" or 2)  "and forceful people grab onto it."