Complex sentence: Aurel Vlaicu died on September 13,1913 near Câmpina while attempting to cross in flight the Carpathian Mountains in his aged "Vlaicu II" airplane, heading to the ASTRA (Asociaţia Transilvană pentru Literatura Română şi Cultura Poporului Român) festivities in Orastie.
Split into simpler sentences: Aurel Vlaicu died in 1913 near Câmpina while attempting to cross in flight the Carpathian Mountains in his aged "Vlaicu II" airplane. His plan was to attend the ASTRA (Asociaţia Transilvană pentru Literatura Română şi Cultura Poporului Român) festivities in Orastie.