The phrase "a simple method that" is correct and usable in written English.
You can use it when introducing a straightforward technique or approach that will be explained or elaborated on in the following text.
Example: "In this article, we will explore a simple method that can help you improve your time management skills."
Alternatives: "an easy approach that" or "a straightforward technique that".
In summary, we have developed a simple method that can achieve colorimetric detection of DNA amplicons.
I've created a simple method that helps anyone answer this question.
Hydrazone crosslinking is a simple method that produces no toxic reagents or side-products.
In addition, a simple method that gives a reasonably accurate estimate of Nmax is also given.
We have devised a simple method that makes it feasible to apply fluorescence techniques to lipid bilayer membranes to elucidate aspects of their structure and dynamics.
Based on analysis results, a simple method that can realize continuous-flow PCR on silicon glass-bonding chip isilicon glass-bonding
Loop-mediated isothermal amplification (LAMP) is a simple method that can amplify DNA with high specificity, sensitivity, and rapidity.
The fatigue limit was defined by a simple method that used incremental applied stress and number of cycles.
Instead, people (and dogs) learn to rely on a simple method that works most of the time: they run in such a way that their angle of gaze to the Frisbee remains roughly constant.
Inspired by that technique, we devised a simple method that encodes temporal information into the spatial domain by exploiting the sparsity of single-molecule samples similar to spatially encoding a spectrum7 or an axial position of single molecules8.
Here we describe a simple method that allows us to investigate the existence and stability of anti-phase bursting solutions in a network of two spiking neurons, each possessing a T-type calcium current and coupled by reciprocal inhibition.
