Complex sentence: But after the opening chapter, the game shifts to protagonist Raiden, players at the time were unaware of this shift at the time as developers kept it a secret by only showing Solid Snake in the trailers.
Split into simpler sentences: But after the opening chapter, the game shifts to protagonist Raiden. Players at the time were unaware of this shift at the time as developers kept it a secret by only showing Solid Snake in the trailers.