Complex sentence: Susaeta came on as a substitute in the 2015 Spanish Cup final, once more lost to Barcelona, and also played in both legs of the the following edition of the Supercopa de España in which his team finally overcame the same opponent.
Split into simpler sentences: Susaeta came on as a substitute in the 2015 Spanish Cup final, once more lost to Barcelona. He also played in both legs of the following edition of the Supercopa de España, in which his team finally overcame the same opponent.