At times it can make for difficult reading.

Not exactly light reading, but not difficult reading either.

"The layering effect would reinforce the screen shields and make readings difficult or impossible."

Another opined that his prose was apt to be difficult reading.

Good thing, because these next few chapters will be difficult reading.

It was difficult reading because the article was highly technical.

Allen's account of the horrors he saw in the New York prisons still makes for difficult reading.

It is not especially difficult reading, but does demand attention.

There is an important difference between a more difficult reading and a more unlikely reading.

Dim lighting and a menu printed partly on a gray background make for difficult reading.