Complex sentence: The Armed Reserve wing of the Kerala Police wore slouch hats up to the 1980s, but today the slouch hat is only worn by Recruit Trainee Police Constables (RTPC) during their training.
Split into simpler sentences: The Armed Reserve wing of the Kerala Police used to wear slouch hats right up to the 1980s. Today the slouch hat is only worn by the Recruit Trainee Police Constables (RTPC) of Kerala Police during their training.