Complex sentence: Development of CADPAT started in the 1990's, but it was not until the turn of the century that widespread adoption began.The Canadian cadets adopted the combat dress and is also worn by civilian instructors for the cadets.
Split into simpler sentences: Development of CADPAT started in the 1990's, but it was not until the turn of the century that widespread adoption began. After this, The canadian cadets adopted the combat dress and is also worn by civilian instructors for the cadets.