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.

Example Input: entity: price
before: unknown
after: known
attr: knowledge
Example Output: knowledge of price was unknown before and known afterwards

Example Input: entity: character
before: looking for wither
after: waiting to attack
attr: state
Example Output: state of character was looking for the wither before and waiting to attack afterwards

Example Input: entity: tank cover
before: on tank
after: lifted off tank
attr: location
Example Output:
location of tank cover was on the tank before and lifted off the tank afterwards