я два года работала в школе, прежде

я два года работала в школе, прежде чем поступить в институт

Results (English) 1:

I worked for two years at the school before enroll in Institute

Results (English) 2:

I worked for two years at the school, before going to college

Results (English) 3:

I have two years, worked in the school, before entering the institute