The phrase "another important discovery" is correct and usable in written English.
You can use it when referring to an additional significant finding or revelation in a particular context, such as scientific research or historical events.
Example: "In addition to the previous findings, the team announced another important discovery that could change our understanding of the disease."
Alternatives: "a further significant finding" or "an additional key discovery."
Another important discovery was the Saffānīyah offshore field in the Persian Gulf.
Dr. James Kendall, of Edinburgh University, reported another important discovery which may make new sources of radium available, thus reducing the high cost.
Interest in biophysics at the Cavendish Laboratory resulted in another important discovery, the structure of deoxyribonucleic acid (DNA), the genetic material.
At the same time, he made another important discovery: "I started to understand that for me art was no longer about self-expression but about creative engagement with the world.
Another important discovery in this study revealed that the particles were more important than the grain boundaries for inducing resistance for microstructurally small fatigue crack growth.
He and colleagues also landed on another important discovery: how overly enthusiastic wine swirlers manage to splash their drinks, possibly staining their sweaters.
As a result, another very important discovery was made: solid chocolate.
Studies on galactoside permease and acetylase led to another highly important discovery.
But he deserves to be credited with another, no less important, discovery related to celebrity that he made early in his own public life, accidentally: the application of celebrity to business.
Another perhaps less remarkable but important discovery is that water, saline, and blue dye do not significantly change the ability of irrigant to penetrate ostia.
Another important new discovery that has brought fractional calculus into prominence is that many physical processes are modeled by fractional differential equations.
