Complex sentence: Duck first appeared in Season 2, and has also appeared in Seasons 3,4,5,6,7,12,17,18,19 and 20, though he appeared in the season 10 music video "Navigation".
Split into simpler sentences: Duck first appeared in Season 2, and has also appeared in Seasons 3,4,5,6,7,12,17,18,19 and 20. He also appeared in the season 10 music video "Navigation".