Complex sentence: Bioturbation is sometimes confused with the process of bioirrigation, however these processes differ in what they are mixing; bioirrigation refers to the mixing of water and solutes in sediments and is an effect of bioturbation.
Split into simpler sentences: Bioturbation is sometimes confused with the process of bioirrigation. Bioirrigation refers to the mixing of water and solutes in sediments and is an effect of bioturbation.