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Transcending time, ancient insects dance vividly within the amber.
Literal
Time [object-を] transcend-[and-て] ancient [attributive-の] insects-[plural-たち] [subject-が] amber [inside-の中で] vividly-[adverbial-と] dance.
Poetic, evocative description. 時を超える ('to transcend time') uses 超える ('to surpass') with 時 metaphorically. 生き生きと ('vividly, lively, with life') is a reduplicated mimetic formed from 生き ('alive') doubled, adding the adverbial と. ~たち is a plural suffix attached to nouns for 'X's, plural.' 琥珀 ('amber,' the fossilized tree resin) is a literary-leaning noun.