Complex sentence: The case, filed by, concerns wheel-warring on the Perth article, after a contentious (initiated by the filer) was closed as successful by; the close was a matter of much contention, with allegations that the move was not supported by consensus.
Split into simpler sentences: The case, filed by, concerns wheel-warring on the Perth article after a contentious (initiated by the filer) was closed as successful by. The close was a matter of much contention, with allegations that the move was not supported by consensus.