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The busier a person is, the more time they find.
Literal
Busy person [to-the-extent-ほど] more time [object-を] find.
ほど marks proportion — 'to the extent that someone is busy.' より多くの is a comparative expression: より (more than) + 多くの (many + attributive の). Another aphoristic sentence about productivity. The structure [adjective + noun + ほど] + comparative is a key pattern for expressing correlations.