Simplify the following text for a Grade 14 native English-speaking person.
Original: Significant wars were fought in Britain , where his general Agricola attempted to conquer Caledonia ( Scotland ) , and in Dacia , where Domitian was unable to procure a decisive victory against king Decebalus .
Simplified: Significant wars were fought in Britain , where his general Agricola attempted to conquer Scotland , and in Dacia , where Domitian was unable to get a decisive victory against king Decebalus .