Complex sentence: Vocational schools were called Technical Colleges in Australia and there were more than 20 schools specializing in Vocational Educational Training (VET) but now-days only 4 four Technical Colleges remain and these are now referred to as Trade Colleges.
Split into simpler sentences: Vocational schools were called Technical Colleges in Australia and there were more than 20 schools specializing in Vocational Educational Training (VET). But, nowadays only four Technical Colleges remain and these are now referred to as Trade Colleges.