Complex sentence: Marijuana can be consumed by rolling up and smoking the flower and leaf portion of the plant or the active ingredients (mainly THC) can be removed from the plant material through various methods such as solvent washing, freezing, mechanical beating, or rubbing.
Split into simpler sentences: Marijuana can be consumed by rolling up and smoking the flower. Alternatively the active ingredients (mainly THC) can be removed from the plant material through various methods such as solvent washing, freezing, mechanical beating, or rubbing.