OG11 CR53,看不懂原句，请教一下

One variety of partially biodegradable plastic beverage container is manufactured from small bits of plastic bound together by a degradable bonding agent such as cornstarch. Since only the bonding agent degrades, leaving the small bits of plastic, no less plastic refuse per container is produced when such containers are discarded than when comparable nonbiodegradable containers are discarded.

哎，第二句，完全看不懂是啥意思啊，句法结构也很晕，求教高人啊