Yeah I believe that diagramming sentences is a lost art along with cursive writing, There were a few cursive styles taught when I was young. I was taught the "Palmer method"
Kafka is very appropriate. It was extremely difficult for me, as an individual, to learn to write cursive. In grammar school was I forced to go to the convent for individual remedial lessons on Saturdays. This happened for a couple of years until the nuns came to the conclusion that I wasn't being difficult on purpose and. I'll never forget the nun who was my teacher threw up her arms and declared: "OK, I believe you, You aren't able to learn to write neatly and correctly. I suggest you become a doctor or pharmacist because that's the only professions that allows such poor penmanship !"