Simplify the following text for a Grade 7 native English-speaking person.
Original: Through questionable practice , Johann Maelzel , incorporating Winkel 's ideas , started manufacturing the metronome under his own name in 1816 : `` Maelzel 's Metronome '' .
Simplified: A man called Johann Maelzel copied Winkelâ s ideas and improved them . He made a small , portable metronome which was patented in 1816 .