Complex sentence: There's nothing preventing non-English sources being used so long as they are reliable and verifiable yet, every time I've communicated with anyone contributing to the article, I am assured that that contributor intends to develop the article providing sources.
Split into simpler sentences: There's nothing preventing non-English sources being used so long as they are reliable and verifiable. Every time I've communicated with anyone contributing to the article, I am assured that that contributor intends to develop the article providing sources.