The phrase "a simpler indicator of" is correct and usable in written English.
You can use it when discussing a more straightforward or easier way to represent or signify something.
Example: "The new model provides a simpler indicator of the overall performance of the system."
Alternatives: "a clearer sign of" or "a more straightforward measure of".
Associations between vitamin D status and extraskeletal complications in observational studies could merely indicate that vitamin D is a "simple" indicator of health status and that compared with healthier subjects sicker subjects could have a lower vitamin D level or status.
Taken in sum, these results clearly indicate that the pupil signal is more complex than a simple indicator of mental effort or arousal alone.
Officers from at least six countries will be present, a simple indicator of the coordinated, multinational nature of the criminal gangs that control the increasingly popular – and arguably increasingly risky – route.
As a first step, the report recommends "building affordable surveillance systems" to detect population changes, including reproductive rates, which can be a simple indicator of a species' health.
Then, because most drinkers added milk to their drinks, the researcher tracked milk use as a simple indicator of overall tea and coffee consumption.
The ratio of seed cotton to stalk (RSS) was linearly correlated with harvest index, and thus can be a simple indicator of dry matter allocation to reproductive structures.
The absolute value of the image gradient |∇I| is taken as a simple indicator of the image contrast C and used as a metric to calculate the scalar weight map.
The objective of this study was to evaluate whether ultrasound assessment of IJV respiratory diameter changes can serve as a simple indicator of fluid responsiveness in mechanically ventilated patients after cardiac surgery.
