The meaning is: some of them were launched a year or several after the first wave of revised characters were published However, since this is now an independent clause, you cannot directly put it after the comma in the original sentence (would be a comma splice). You could make a new sentence or use a semicolon. "after" is a preposition.
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However, since this is now an independent clause, you cannot directly pu
park sang joonBy the way, I'd like to know whether I can omit the repeated verb from the preceding phrase, not a clause.I'm not sure what you are asking. Please write the full sentence with the omission as you envisage it.
The omitted verb is the main verb in the relevant part, i.e. "the new