Complex sentence: When the first red page is put into the book, Sirrus is able to barely see someone looking into his red book, he implored the player to find more red pages which were scattered in the four remaining ages of Myst.
Split into simpler sentences: When the first red page was put into the book, Sirrus is able to barely see someone looking into his red book. He implored the player to find more red pages which were scattered in the four remaining ages of Myst.