Complex sentence: Although Joy tried to make the move positive and happy, Sadness make an memory from happy to sad, and after Joy fixed it, she made Sadness read "mind manuals" for the rest of the day.
Split into simpler sentences: Although Joy tried to make the move positive and happy, Sadness made a memory change from happy to sad. After Joy fixed it, she made Sadness read "mind manuals" for the rest of the day.