Simplify the following text for a Grade 9 native English-speaking person.
Original: As a general , Wellington is often compared to the 1st Duke of Marlborough , with whom he shared many characteristics , chiefly a transition to politics after a highly successful military career .
Simplified: As a general , Wellington is often compared to the 1st Duke of Marlborough . They had many things in common including dealing in politics after a highly successful military career .