Complex sentence: Metastability remains poorly understood in some circles, and various engineers have proposed their own circuits said to solve or filter out the metastability; typically these circuits simply shift the occurrence of metastability from one place to another.
Split into simpler sentences: Metastability remains poorly understood in some circles, and various engineers have proposed their own "pet circuits" said to "solve" or "filter out" the metastability. Typically these circuits simply shift the occurrence of metastability from one place to another.