Complex sentence: Building is simple, the player selects an artifact stored in his or her belt and then selects the part of the island where the structure will be placed (certain structures, such as hangars, are limited to certain spots on the island).
Split into simpler sentences: Building is simple, the player selects an artifact stored in his or her belt. Then the player selects the part of the island where the structure will be placed (certain structures, such as hangars, are limited to certain spots on the island).