Complex sentence: Getting up from the wreckage, he witnesses Ultraman entering a LexCorp building for Kryptonite where he insufflates the dust from crushed Kryptonite to gain strength.
Split into simpler sentences: Getting up from the wreckage, he witnesses Ultraman entering a LexCorp building for Kryptonite. Lex witnesses him insufflating dust from crushed Kryptonite to gain strength.