That is, the health of all the soil microbes that decompose and make available to plants the wealth of minerals and nutrients that are present.
(all the soil microbes; decompose; ) (all the soil microbes; make; available to plants the wealth of minerals and nutrients) (minerals and nutrients; are; present)
all the soil microbes all the soil microbes minerals and nutrients
decompose make are
available to plants the wealth of minerals and nutrients
present