Complex sentence: Jaakson studied in H. Treffner's Private High School and 1892-1896 in the legal department of Tartu University, graduated with the 1st degree diploma (simple graduation).
Split into simpler sentences: Jaakson studied in H. Treffner's Private High School and studied law at Tartu University from 1892 to 1896. He graduated with a 1st degree diploma (simple graduation).