한 왕조가 망하고 다른 한 왕조가 일어나는 데에는 그럴 만한 이유가 있는 것이므로...
Because there is such a considerable reason in aspect of perishing a dynasty and rising another dynasty, ...
데에는 means "in aspect of"
데에는 is composed of 데+에+는
데 means "place, point; part, aspect, feature"
에 means "in"
는 is a topic marker.
그럴 만한 means "as such"
그럴 만한 이유 means "such a considerable reason"
그러하다(such) + -(으)ㄹ 만하다 => 그러할 만하다 => 그럴 만하다.
Generally, -(으)ㄹ 만하다 means that there is enough reason or justification for a certain situation
or that something is doable or possible, but mainly in the sense of being “bearable” to do.
Examples
가다
→ 갈 만하다
= to be possible to go
= to be worth going (and checking out the place)
= there is enough justifiable reason for one to go
먹다
→ 먹을 만하다
= to be edible
= to taste okay (the taste is bearable)
= the taste is acceptable
늦다
→ 늦을 만하다
= to be forgivable for being late
= there is enough reason for being late
놀라다
Sample Sentences
1. 그럴 만해요.
= It’s understandable to be so.
= It’s possible.
= There is enough reason for it to be so.
2. 그 사람은 인기가 있을 만해요.
= There is enough reason that he is popular.
= It’s understandable why he is popular.
3. 이 책 읽을 만해요?
= Is this book worth reading?
= Is this book good?
= Do you recommend this book?