Complex sentence: Intelligence-led policing originated in Britain in the 1990s, and has gained considerable momentum globally following the September 11 terrorist attacks on the United States, and is now advocated by the leading police associations in North America and the UK.
Split into simpler sentences: Intelligence-led policing originated in Britain in the 1990s, and has gained considerable momentum globally following the September 11 terrorist attacks on the United States. It is now advocated by the leading police associations in North America and the UK.