Complex sentence: The number of demons the player can summon depends on the player's and the demon's "kilodevil" values: a player with 100 kilodevil can summon two 50-kilodevil demons.
Split into simpler sentences: The number of demons they can summon depends on the player's and the demon's "kilodevil" value. For instance, a player with 100 kilodevil can summon two 50-kilodevil demons.