Definition: Given an entity, a before event, an after event, and an attribute related to the entity, generate a sentence as output. Your sentence should show the changes in the attribute of the entity.
Input: entity: the hired contractor 
before: unknown to be licensed and insured in state 
after: known to be licensed and insured in state 
attr: step

step of the hired contractor was unknown to be licensed and insured in the state before and known to be licensed and insured in the state afterwards