Complex sentence: Kaliski was a specialist in the field of applied physics-he developed theory of continuous amplification of ultra and hyper-sounds in semiconductive crystals, obtained plasma temperature of tens of millions of kelvins using laser impulse.
Split into simpler sentences: Kaliski was a specialist in the field of applied physics. He developed the theory of continuous amplification of ultra and hyper-sounds in semiconductive crystals and obtained plasma temperature of tens of millions of kelvins using laser impulse.