Complex sentence: Frenchman Lech Tomasz Kisielewicz who in 1995 allegedly committed lèse majesté by making a derogatory remark about a Thai princess while on board a Thai Airways flight in international airspace was taken into custody upon landing in Bangkok and charged with offending the monarchy.
Split into simpler sentences: Frenchman Lech Tomasz Kisielewicz allegedly committed lèse majesté in 1995 by making a derogatory remark about a Thai princess while on board a Thai Airways flight. Although in international airspace at the time, he was taken into custody upon landing in Bangkok and charged with offending the monarchy.