Sentence 1: He was the son of Niall MacNeill founder of the Irish Volunteers which Eoin MacNeill joined later becoming an officer in the Irish Army .
Sentence 2: He was the son of Eoin MacNeill , the founder of Irish Volunteers , whom Niall MacNeill later joined in the Irish Army as an officer .
Question: Do Sentence 1 and Sentence 2 express the same meaning? Yes or No?