Complex sentence: Crafting is a trainable skill in the MMORPG "RuneScape" that allows players to increase their skill levels by combining raw materials in various ways to create useful items that can be used in other skills or sold for profit.
Split into simpler sentences: Crafting is a trainable skill in the MMORPG "RuneScape". It allows players to increase their skill levels by combining raw materials in various ways to create useful items that can be used in other skills or sold for profit.