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: roots
before: potted
after: exposed
attr: exposure
exposure of roots was potted before and exposed afterwards

entity: pistol
before: equipped
after: hostered
attr: location
location of pistol was equipped before and hostered afterwards

entity: screw
before: attached to knob
after: separated from knob
attr: orientation
orientation of screw was attached to knob before and separated from knob afterwards