In January 2000是时间状语,
he 是主语,
led 是谓语,
a group是宾语,
in a rebellion 是地点状语,
of Indians 是定语,用来修饰a group
that ousted President XXX是定语,用来修饰a rebellion
he led a group in a rebellion 是主句
[注]
以后看见这类句子,只要找出主句便可迎刃而解
[付]
有时,定语从句用which 或that引导