The phrase "a complex piece of software" is correct and usable in written English.
You can use it when describing software that has intricate features, functionalities, or architecture.
Example: "The new application we developed is a complex piece of software that integrates multiple systems and provides advanced analytics."
Alternatives: "a sophisticated software application" or "an intricate software solution."
We can fully develop an airplane and literally fly it as a complex piece of software.
An agent for TAC SCM is a complex piece of software that must operate in a competitive economic environment.
It is clear that TRAMO-SEATS is a complex piece of software.
A buyer's market, where companies needing specific solutions say a complex piece of software or the design of a custom integrated circuit post their needs on the exchange, in the form of a "problem description".
A complex piece of software like Macromedia Director involved a couple of humongous volumes and required an enormous box to accommodate the books (which took up a fair bit of space on my shelf).
Yup, there's an app for that, so even talentless people, or small farm animals for that matter, can push a few buttons at random and a complex piece of software will clean up their percussive ramblings and turn them into something pretty.
Perhaps surprisingly, while genome browsing tools remain under very active development, the general approach taken by the major browsers has remained constant: a complex piece of server software reads databases, integrates information and creates bitmap image files that are displayed in the user's web browser window.
It would take a very complex piece of software to actually calculate each student's absolute valuation of a specific schedule and then generate an optimal matching.
It also flags as "red" concerns that resources have been diverted in order to meet the first milestone deadline for Lorenzo release 1, a less complex piece of software providing clinical functionality.
It tremendously simplified Git, an inherently complex piece of software, and allowed coders to collaborate easily over the Internet, providing messaging and social features that would feel familiar to current users of social networks — for example, the ability to follow particular chunks of code in projects the way one might follow people on Twitter.
Ahead of today's announcement, I talked to Rohan Kumar, the general manager of Microsoft's Database Systems group, to get a bit more info about the history of this project and how his team managed to bring an extremely complex piece of software like SQL Server to Linux.
