一段翻译中of more than的意思以及through which的用法

问题描述

据记载，狮舞已拥有了2000多年的历史。……因此，舞狮成为元宵节和其他节日的习俗，人们以此来祈祷好运、平安和幸福。

The Lion dance has a recorded history of more than 2000 years. …Gradually the lion dance has developed into a custom performed at the Lantern Festival and other festive occasions through which people could pray for good luck, safety and happiness.

请问专家老师：

(1) of more than 的 of 表示什么意思？

(2) through which 的 which 指的是什么？

老师答疑

黎老师：

(1) ...of more than 的 of 的意思是“的……”：

a history of 2000 years 2000年的历史

history of more than 2000 years 2000多年的历史

(2) through which 的 which 指的是a custom.