Complexity and diversity

I am reading the book Complexity and the Arrow of Time by Lineweaver, et al. (Cambridge Univ. Press, 2013)  Perhaps the problem is that complexity and diversity are again simply the names of vector quantities, quantities having components like: genome length, the number of cell types, the number of niches, the number of species, the specialization of body parts, the number of component functions, etc. (If these things can be measured.)