句子翻译：
然而,证据开始慢慢地积累,动物园的专家感到有义务展开调查,因为那些声称看美洲狮的人提供的描述是那么的相似.
for the descriptions given by people who claimed to have seen the puma were extraudinarily similar中,主句是：descriptions were similar（描述相似）.因此,who claimed to have seen the puma是people的定语重句,解释什么样的人,而given by people这一被动结构修饰descriptions,表示谁给的描述.
仅供参考