The phrase "yet difficult" is correct and usable in written English.
It is used to describe a situation that is challenging, complicated, or not easy. For example, "This problem is yet difficult to solve."
Batmanglij is friendly and talkative yet difficult to know.
It is in your hands to apply this easy, yet difficult, formula.
Perhaps one of the most obvious, yet difficult, of Jensen Arnett's 'adult criteria' is being able to be financially independent.
The film is slight and unfocused, yet difficult to dislike because of its generous and noble subjects.
The great merit of "Lincoln" is its dramatization of the modest yet difficult practicalities behind monumental deeds.
For the latter, bonuses are laid out as tangible yet difficult to attain prizes to boost your paltry wage.
"When present, methane can be dangerous and yet difficult to detect by the consumer, hence the importance of testing groundwater for the presence of this dissolved gas".
"We thank our clients, employees and partners for their steadfastness during a brief yet difficult period and we are getting back to business as usual".
As on many popular yet difficult mountains, ropes and ladders are fixed permanently into the rock and ice, and huts line the route to the summit.
It's a model compromise, mixing pro-business pragmatism with a commitment to protecting workers — future Americans — who do some of the country's most vital yet difficult jobs.
The separation of propane/propylene mixtures is an important yet difficult separation.
