Complex sentence: She accepted to go back and join the final year students in 1998 and at the end of the year, she sat for the KCPE and got grades and was selected by two secondary schools to join them.
Split into simpler sentences: She accepted to go back and join the final year students in 1998. At the end of the year, she sat for the KCPE and got grades and was selected by two secondary schools to join them.