Complex sentence: Development can be traced back to "Sonic Crackers", a 1994 prototype for the Sega Genesis featuring Sonic and Tails, with which the developers experimented with the ring force tether.
Split into simpler sentences: Development can be traced back to "Sonic Crackers", a 1994 prototype for the Sega Genesis. It featured Sonic and Tails, and the developers used it to experiment with the ring force tether.