Complex sentence: The higher the pouring temperature, the greater the fluidity; however, excessive temperatures can be detrimental, leading to a reaction between the material and the mold; in casting processes that use a porous mold material the material may even penetrate the mold material.
Split into simpler sentences: The higher the pouring temperature the greater the fluidity, however excessive temperatures can be detrimental. High pouring temperatures can lead to a reaction between the material and the mold; in casting processes that use a porous mold material the material may even penetrate the mold material.