Simplify the following text for a Grade 9 native English-speaking person.
Original: He also made an arrangement of MysliveÄ ek 's aria `` Il caro mio bene '' ( from the opera Armida of 1780 ) .
Simplified: He also made an arrangement of an operatic aria by MysliveÄ ek 's : `` Il caro mio bene '' .