Complex sentence: The player's weaponry is more restricted in arcade mode than during the campaign, although destroying certain marked targets replenishes the player's stock of weaponry you can still end up with no weapons at all if you waste to much ordinance.
Split into simpler sentences: The player's weaponry is more restricted in arcade mode than during the campaign. Although destroying certain marked targets replenishes the player's stock of weaponry, you can still end up with no weapons at all if you waste too much ordinance.