Complex sentence: Not that this is necessarily a bad thing, but the combination of increasingly specialized questions and the existing process seems to cause a crash in this process after 2007, with successful nomination falling upwards of 40% for each successive year thereafter.
Split into simpler sentences: Not that this is necessarily a bad thing, but the combination of increasingly specialized questions and the existing process seems to cause a crash in this process. After 2007, successful nomination fell upwards of 40% for each successive year thereafter.