第一个where是定语从句,修饰park.第二个that是强调句型“it was .that.”此句型可以在翻译时省略.可以翻译为那位老人就是在那个第一次遇到妻子的公园里告诉了我们他的爱情故事.句子可以这样分开：it was in the park（where the old man met his wife for the first time ）that he told us his love story.