Complex sentence: After hearing about the tournament, Zack enters to increse his popularity and make a name for himself; he apparently succeeds (to an extent), as well as earns a high enough ranking in the tournament to gain a prize of signifigant monetary value.
Split into simpler sentences: After hearing about the tournament, Zack enters to increase his popularity and make a name for himself. He also earns a high enough ranking in the tournament to gain a prize of significant monetary value.