In court, the better the evidence, the more weight it is given.
The sentence above is called a parallel comparative construction (there should be a comma to separate its two members). It can be expanded as follows:
- The better the evidence is, the more weight the evidence is given.
It can be paraphrased as follows:
- As the quality of the evidence increases, so does the importance that the court attaches to it (in other words: the court will attach more importance to the evidence if the quality of the evidence is higher).