Complex sentence: On 1993 Aeroméxico Group took over Mexicana the second largest airline in the Mexican market under the same management there was a great dispute in June 1993 with the pilot union regarding the transfer of flights to regional subsidiary Aeromonterrey, which had non-union pilots.
Split into simpler sentences: On 1993 Aeroméxico Group took over Mexicana the second largest airline in the Mexican market under the same management. There was a great dispute in June 1993 with the pilot union regarding the transfer of flights to regional subsidiary Aeromonterrey, which had non-union pilots.