This is the 9099th most frequent French word.
compliquées
Complicated or complex.
In this context, 'compliquées' describes the subject 'mathematics' as being difficult or complex.
Les mathématiques sont compliquées pour de nombreux élèves.
Mathematics are complicated for many students.
Here, 'compliquées' qualifies the 'instructions,' indicating they are overly intricate or hard to understand.
Les instructions pour assembler le meuble étaient trop compliquées.
The instructions for assembling the furniture were too complicated.
In this sentence, 'compliquées' is used to explain the speaker's perception that she considers 'human relationships' challenging or complex to navigate.