we have 是定语从句,省略了关系代词that 因为关系代词做宾语所以可省略.先行词是records做从句的宾语,整个句子是这样分的.They 是主句的主语are是系动词 the first是定语修饰后面的名词,records是表语.we have 是定语从句,of Europeans sailing to the America是解释名词records的做同位语.