Complex sentence: Major diseases such as malaria, AIDS and influenza are caused by coevolving parasites, and better understanding of coevolutionary adaptations between parasite attack strategies and host immune systems may assist in the development of novel medications and vaccines.
Split into simpler sentences: Major diseases such as malaria, AIDS and influenza are caused by coevolving parasites. Better understanding of coevolutionary adaptations between parasite attack strategies and host immune systems may assist in the development of novel medications and vaccines.