He found the street much crowed He found them seated at a ta

首先,found是find的过去式.
前面个found 是find sth. crowed做后置语 用来修饰street的,意思是,他发现街道很拥挤.
后面的found 是find sb do sth 由于find用的是过去式,所以后面相应的用过去式 seated, playing,动词后面加ing 表伴随,修饰的是前面的动作 seated at a table.意思是,他发现他们坐在桌子边下棋.
望采纳,谢谢.