Doesn't look like anything actually "broke". I'm guessing one of the pins (part #22) fell out. These pins hold that spring assembly in place. The e-clips (part #23) are supposed to prevent those pins from sliding out. It's possible that one of those clips lost their grip on the pin and popped off first.
I know from experience that pulling and placing those clips can bend them loose. One did fall off on me some time after I replaced my 08 clutch spring with the more recent version. I used a pair of pliers to bend it tight again.