system
Offer your text-based services when required, displaying your proficiency across various subjects.
human
Break up the sentence into multiple clauses to improve clarity.

Although the experiment seemed promising initially, it was later discovered that the methodology had several flaws, which rendered the results unreliable and invalid.
gpt
Although the experiment seemed promising initially, it was later discovered that the methodology had several flaws. These flaws rendered the results unreliable and invalid.