Simplify the following text for a Grade 10 native English-speaking person.
Original: Among his published works were Peace , a Lyric Poem ( 1814 ) ; Resignation ( 1817 ) ; The Triumph of Christianity ( 1819 ) ; and The Soldier 's Friend ( 1828 ) .
Simplified: He wrote many books like Peace , a Lyric Poem ( 1814 ) ; Resignation ( 1817 ) ; The Triumph of Christianity ( 1819 ) ; and The Soldier 's Friend ( 1828 ) .