Original: Fighting their way through obstacles, such as the Sirens and Circe's island, Percy and Annabeth join up with Clarisse, Grover, and later Tyson, and escape with the Golden Fleece.
Simplified: Fighting their way through many other obstacles, like the Sirens and Circe's island, they join up with Clarisse, Grover, and later Tyson (who did not die), and leave with the Golden Fleece.