Complex sentence: MZX was fairly popular with the ZZT community due to its new features, and Janson stayed around with the newly-formed MZX community for a while, releasing an entirely different game, "Weirdness", which utilized the improvements made in MZX 2.00.
Split into simpler sentences: MZX was fairly popular with the ZZT community due to its new features, and Janson stayed around with the newly-formed MZX community for a while. He later released an entirely different game, "Weirdness", which utilized the improvements made in MZX 2.00.