Complex sentence: When Miss Farnsworth indicates that he is healthy enough and will have to leave the school in a few days, he tries to convince her to let him stay as a gardener and tells Miss Morrow that he has fallen in love with her.
Split into simpler sentences: When Miss Farnsworth indicates that he is healthy enough and will have to leave the school in a few days, he tries to convince her to let him stay as a gardener. He furthermore tells Miss Morrow that he has fallen in love with her.