Before revision:  However, the inability of humans to understand how their own subjective awareness arises (related to the so-called ' hard problem' of consciousness) is because the attention schema is inherently incomplete.
After revision:  Moreover, this representation is incomplete for efficiency reasons. This inherent incompleteness of the attention schema results in the inability of humans to understand how their own subjective awareness arises (related to the so-called ' hard problem' of consciousness) is because the attention schema is inherently incomplete.