The phrase "a complicated task that" is correct and usable in written English.
You can use it when describing a specific task that has multiple challenging elements or requires significant effort to complete.
Example: "Completing the project on time was a complicated task that required careful planning and coordination among team members."
Alternatives: "a challenging task that" or "a difficult task that".
Modeling natural systems is a complicated task that involves the concurrent behavior of various processes, mechanisms and objects.
Growing up is a complicated task that involves learning societal norms and obeying authority figures while trying to discover your true self.
Mr. Hero's organization has already cleared rights, removing a complicated task that often burdens Kultur in its global search for opera, dance and classical music.
After assembling the machine, a complicated task that required a knowledge of soldering, he and his 6-year-old son managed to print a bottle opener.
We understand that estimating all the CSI by the source is a complicated task that may induce transmission delays.
In laparoscopic surgeries that require the use of various instruments, exchanging instruments is a complicated task that consumes 10 30% of the total procedure time [6].
Transforming the company's whole marketing effort in this manner was a difficult, complicated task that might easily have overwhelmed a less skilled team.
Clearly, this problem was relatively easy for aTNS and ENS students, so we will examine student solutions to a more complicated task that was meant to help differentiate between the TNS and ENS students.
It would require retooling the drug in a costly and complicated task that might not work, and he would have to make his case to two companies that had already poured hundreds of millions of dollars into the drug and were eager to move it forward.
In English, we say that someone has their work cut out when there is a big or complicated task that needs to be completed.
The more complicated task that lies ahead is to decipher how this variation impacts cell and body function.
