Simplify the following text for a Grade 11 native English-speaking person.
Original: Although some counties were left without lieutenants during the 1590s , following the defeat of the Spanish Armada , the office continued to exist , and was retained by James I even after the end of the war against Spain in 1604 .
Simplified: After the defeat of the Spanish Armada , the need for lieutenants was reduced â '' and the lieutenancies of some counties were left vacant in the 1590s .