Complex sentence: However, it could not arrest Brabham's swift decline, and it quickly became clear that 1986 would not be the year the team recaptured its glory days of the early 1980s.
Split into simpler sentences: However, it was not effective and could not arrest Brabham's swift decline. It quickly became clear that 1986 would not be the year the team recaptured its glory days of the early 1980s.