Complex sentence: The defeat led to a period of instability in ASLEF culminating in a brawl at a barbecue at the union's London headquarters, which resulted in a number of senior officers being removed from their positions, including Brady.
Split into simpler sentences: The defeat led to a period of instability in ASLEF culminating in a brawl at a barbecue at the union's London headquarters. This resulted in a number of senior officers being removed from their positions, including Brady.