Learn Portuguese (Portugal): Embora veja os relâmpagos, ela continua a caminhar. - Even though she sees the lightning, she continues to walk.

The word embora (even though / although) introduces a contrasting idea and always triggers the subjunctive mood in Portuguese. That is why we must use the present subjunctive veja instead of the present indicative vê.

Why is os relâmpagos plural when the English translation just says 'lightning'?

In English, 'lightning' is an uncountable noun. However, in Portuguese, relâmpago is countable (meaning a lightning bolt or flash). When referring to a storm with multiple flashes, Portuguese speakers naturally use the plural os relâmpagos.

Why is there an a between continua and caminhar?

The verb continuar requires the preposition a when it is followed by an infinitive verb to mean 'to continue doing something'. This is a standard pattern in European Portuguese: continuar a + [infinitive].

Could we leave out the pronoun ela in the second half of the sentence?

Yes, but keeping it prevents ambiguity. The present subjunctive veja shares the exact same form for eu, ele, ela, and você. By explicitly saying ela in the second clause, it becomes immediately clear who is seeing the lightning and walking.