I'd appreciate a way to rephrase it, ideas? The 1984 is when Sigma Nu Delta rejoined, not when Sigma Nu's policies changed.
Probably something like:
In response to the national fraternity's segregationist membership policies, the fraternity went local in 1963, becoming Sigma Nu Delta. The national fraternity's policies were changed in <whatever year it happened>, and in 1984 the fraternity reaffiliated with the national.
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