я два года работала в школе, прежде

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

Results (English) 1:

I worked for two years in high school before she entered the Institute of

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 the citation in the Institute