Complex sentence: Upon returning to the Winter Palace, the Inquisitor must decide whether to disband the Inquisition, meaning efforts against Solas will be weaker, or repurpose it to serve Divine Victoria, posing the risk of corruption in the ranks.
Split into simpler sentences: Upon returning to the Winter Palace, the Inquisitor must decide whether to disband the Inquisition or repurpose it to serve Divine Victoria. Disbanding the Inquisition means that efforts against Solas will be weaker, while keeping it intact poses the risk of corruption in the ranks.