Complex sentence: How Kovacs was able to see through the presumably opaque fabric of his trademark mask is never explained in the comic books; however, it can be assumed that either it wasn't truly opaque on both sides or that he possesses preternatural abilities of navigation and echolocation.
Split into simpler sentences: How Kovacs was able to see through the presumably opaque fabric of his trademark mask is never explained in the comic books. However, it can be assumed that either it wasn't truly opaque on both sides or that he possesses preternatural abilities of navigation and echolocation.