Complex sentence: The rotavirus genome is composed of segmented, double stranded RNA; it is large in size and is likely to have infected every child in the world before five years of life, typically it is not a life-threatening infection, but it can be.
Split into simpler sentences: The rotavirus genome is composed of segmented, double stranded RNA; it is large in size and is likely to have infected every child in the world before five years of life. Typically it is not a life-threatening infection, but it can be.