My husband occasionally enjoys a drink.

Literal

Husband [topic-は] occasionally sake [object-を] savors [polite-ます].

たしなむ is an elegant verb meaning 'to enjoy in moderation / to partake of tastefully.' 御酒 uses the honorific prefix 御 (ご/お) on 酒. たまに = 'occasionally.' A refined way to describe moderate drinking.