Complex sentence: During a round, each player can either utilizes an Attack Spell of their choice, trying to deal the most damage to their opponent, or can activate a Support Spell and/or use Power Points to increase his Attack Spell.
Split into simpler sentences: During a round, each player alternately utilizes an Attack Spell of their choice, trying to deal the most damage to their opponent. Each player can also activate a Support Spell and/or use Power Points to increase his Attack Spell.