Complex sentence: In his anger and rush to leave, Mark smashes into the whole glass office twice, the first time injuring his face; the second time shattering it, severely injuring himself more and ripping his clothes.
Split into simpler sentences: In his anger and rush to leave, Mark smashes into the whole glass office twice. The first time; injures his face; the second time shattering it, severely injuring himself more and ripping his clothes.