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.

entity: key habit 
before: unknown 
after: known 
attr: key habit
key habit of key habit was unknown before and known afterwards

entity: years of experience 
before: unknown 
after: known 
attr: knowledge
knowledge of years of experience was unknown before and known afterwards

entity: the stem 
before: connected 
after: cut off 
attr: state

state of the stem was connected before and cut off afterwards

