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: seedling 
before: exposed 
after: protected 
attr: coverage
Example Output: coverage of seedling was exposed before and protected afterwards

Example Input: entity: potato 
before: white 
after: browned 
attr: color
Example Output: color of potato was white before and browned afterwards

Example Input: entity: surface 
before: thicker 
after: thinner 
attr: thickness
Example Output:
thickness of surface was thicker before and thinner afterwards

