Complex sentence: This has had a knock on effect with fewer and fewer officers opting to train as detectives and certainly within the UK nationally there is a shortage of trained detectives and police forces can be seen competing with each other for detectives to transfer to them from other forces.
Split into simpler sentences: This has had a knock-on effect with fewer and fewer officers opting to train as detectives. Within the UK nationally there is a shortage of trained detectives and police forces can be seen competing with each other for detectives to transfer to them from other forces.