The phrase "a complex and subtle" is correct and usable in written English.
It can be used to describe something that has intricate details or nuances, often in contexts like art, literature, or analysis.
Example: "The author's writing style is a complex and subtle blend of humor and tragedy that captivates the reader."
Alternatives: "a nuanced and intricate" or "a sophisticated and delicate".
Competing for contracts is a complex and subtle sport, governed by highly bureaucratic bidding rules and the old-fashioned arts of access and influence.
With the rising of online social networks, influence has been a complex and subtle force to govern users' behaviors and relationship formation.
It will be fascinating because Go is such a complex and subtle game that many experts thought it would take years, if not decades, for computers to be able to compete with the best human players.
The plant fluorescence lifetime was related to its chlorophyll content in a certain range, and there is a complex and subtle relationship between plant fluorescence lifetime and its physiological information.
While Martin was influenced by male abstract artists from Ellsworth Kelly to Rothko, her paintings resonate with the status of the female artist in post-war America in a complex and subtle way.
For example, such decisions can relate to when to discharge from the emergency department, versus admit, when to discharge from the hospital, when to transition from one part of the hospital to another, etc. Patient disposition is a complex and subtle decision with profound implications to the patient.
Sleep may appear a very natural part of our existence, but in reality it's a highly complex and subtle neurological process with a lot of room for stuff to go wrong, both as we're going to sleep and as we're waking up.
Fiction and reality are so seamlessly blended in "It Runs in the Family," a surprisingly complex and subtle portrait of the Grombergs, a high-powered clan of New York lawyers, that the temptation to assume its characters are modeled after the actors playing them is almost irresistible.
This hypothesis, however, was not confirmed, suggesting that the observed allelic disparity is perhaps not merely a function of the number of divisions after a single event but the result of a more complex and subtle evolutionary process.
With plays increasingly calling for a deeper understanding of psychological motivation, Stanislavsky saw the necessity for a more complex and subtle technique for transforming the thought processes and emotions of the actor into those of the character.
In later work these concerns become a more complex and subtle exploration of history and self.
