Complex sentence: GameMaker allows users to create a cross-platform video game using drag and drop or a scripting language known as Game Maker Language, which can be used to develop more advanced games that could not be created just by using the drag and drop features.
Split into simpler sentences: GameMaker allows users to create a cross-platform video game using drag and drop. GameMaker does, however, provide a scripting language known as Game Maker Language, which can be used to develop more advanced games that could not be created just by using the drag and drop features.