"previously conducted" is correct and usable in written English.
You can use it to indicate a past action that has been completed. For example: "The research team previously conducted a similar study."
The stress tests were previously conducted in 2011 and 2014.
The health board previously conducted retrospective and resource intensive investigations into suspected breaches.
The original said Robert Ziegler had previously conducted 2001 at London's Southbank Centre.
The move will bring to London a practice that was previously conducted through Hong Kong.
He also previously conducted research as a Wertheim Fellow with the Harvard Law School.
"A large amount of the business previously conducted at Billinghurst will be transferred to Olympia," Mr. Woodhead said.
The stress tests have become a focus since the 2008 banking crisis and were previously conducted in 2011 and 2014.
She previously conducted research on mindfulness meditation as a graduate student at Erasmus University's Rotterdam School of Management.
Experimental tests were previously conducted on a bearing test specimen and countersunk fastener single-lap joints.
Comparisons with previously conducted experiments and detailed finite element analyses validated the accuracy of the model.
Joost previously conducted research at the University of Oxford, the EUI in Florence, and New York University.
