Complex sentence: A fixed-price contract is a contract where the amount of payment does not depend on the amount of resources or time expended, as opposed to a cost-plus contract which is intended to cover the costs plus some amount of profit.
Split into simpler sentences: A fixed-price contract is a type of contract where the payment amount does not depend on resources used or time expended. This is opposed to a cost-plus contract which is intended to cover the costs plus some amount of profit.