он изучает его самостоятельно в теч

он изучает его самостоятельно в течении двух лет
в школе он учил французский в течении 6 лет

Results (English) 1:

He studies it yourself within two yearsat school he taught French throughout the 6 years

Results (English) 2:

he studies his own for two years
at the school he studied French for 6 years

Results (English) 3:

he is exploring his own for two yearsin high school, he taught french for six years.