Complex sentence: The ultimate goal of the game is usually to capture all enemy castles and defeat all enemy heroes although the game comes with many different worlds (scenarios) to play, and some scenarios have special victory conditions such as accumulating gold or finding a particular artifact.
Split into simpler sentences: The ultimate goal of the game is usually to capture all enemy castles and defeat all enemy heroes. However, the game comes with many different play scenarios, and some of these scenarios have unique victory conditions, such as accumulating a certain amount of gold, or finding a particular artifact.