Complex sentence: As player controls Shrek on collecting items for the picnic, they will have to go through minigames and challenges in order to complete the level and receive items, or collecting throughout the area, certain challenges or minigames will a time limit, for some will not.
Split into simpler sentences: As player controls Shrek on collecting items for the picnic, they will have to go through minigames and challenges, in order to complete the level and receive items. Additionally, you could collect throughout the area, certain challenges or minigames will contain time limit, for some will not.