Complex sentence: Two technologies, Terahertz time-domain spectroscopy and quantum cascade lasers, which have been developed only recently throughout the past two decades, could possibly be part of a multitude of development platforms worldwide.
Split into simpler sentences: Two technologies, Terahertz time-domain spectroscopy and quantum cascade lasers, which have been developed only recently throughout the past two decades. These could possibly be part of a multitude of development platforms worldwide.