Weakly compactly generated Banach spaces and their subspaces are characterized by the presence of projectional skeletons with some additional properties. We work with real spaces. However the presented statements can be extended, without much extra effort, to complex spaces.
"WCG spaces and their subspaces grasped by projectional skeletons." Funct. Approx. Comment. Math. 59 (2) 231 - 250, December 2018. https://doi.org/10.7169/facm/1721