A person who agrees to serve as a mediator between two warring factions at the request of both abandons by so agreeing the right to take sides later.
Does this sentence mean:
A person who agrees to serve as a mediator between two warring factions (at the request of both) abandons the right to take sides later.
If this is the case why is there a "by so agreeing"?
Or does this sentence mean:
A person who agrees to serve as a mediator between two warring factions at the request of both, by agreeing so, abandons the right to take sides later.
If this is the case, why should it be "by so agreeing"?
Is there any grammar reference for this kind of sentence structure? Could someone come up with similar examples, please? This sentence really confused me at first; I thought it meant:
A person agrees to serve as a mediator between two warring factions, at the request of both abandons, by so, agreeing the right to take sides later. (A mediator agrees to take the role by agreeing he can take one side later...)