"complex syntax" is a correct and usable phrase in written English.
You can use it when referring to a sentence or phrase with intricate structure and/or many elements. For example: "The novelist's complex syntax was a difficult but rewarding task to parse."
They found a complex syntax that did vary.
A trained classicist, Phillips plays complex syntax against free-verse line breaks, juxtaposing clarity and ambiguity.
Fat Chance is very much a written book, with a more complex syntax and temporal structure than its predecessors.
Their only other encounter with any of the plays could have been in a stuffy classroom, heaving with hormones, where they were intimidated by complex syntax, intricate metaphors and Elizabethan in-jokes – and way too embarrassed to admit it.
He likes to play complex syntax against free-verse line breaks, allowing the ostentatious control of the former to challenge the inherent arbitrariness of the latter much the way that waves build and disperse across a beach.
In any case, complex syntax and richness of language are forbidden to texts meant to be sung, for music engages too much of the hearer's attention for him to untangle an ambitious construction or relish an original image.
Neither the unfamiliar and complex musical syntax nor the cheerful ending was to his liking.
Since the role of AutoTutor in this system was to facilitate discussion on the principles and features of an existing problem, it was unnecessary to make the learner write complex math syntax.
I simply have not had time to delve deeply into the entire catalogue of Russian curse words or what I am sure is it's complex grammar, syntax and dulcet melody.
The language is often knotty and difficult, the syntax complex, and the over-all intellectual ambition astoundingly high.
Ted Hughes does not attempt to re-enact the eerily complex metrics and syntax of Aeschylus: I've finished with tears.
