Complex sentence: Most games go into what is called "crunch time" near deadlines; developers (programmers, artists, game designers and producers) work twelve to fourteen hours a day and the testers must be right there with them, testing late-added features and content.
Split into simpler sentences: Most games go into "crunch time" near deadlines with developers (programmers, artists, game designers and producers) working twelve to fourteen hours a day. The game-test team must be right there with them, testing late-added features and content.