Complex sentence: By 2000, he decided to drop creative writing, and spent his time playing video games, as well as toying around with the level editors from games like "Duke Nukem 3D" and "Half-Life".
Split into simpler sentences: By 2000, he decided to drop creative writing, and spent his time playing video games, as well as toying around with. The level editors from games like "Duke Nukem 3D" and "Half-Life".