Complex sentence: In the last year of my 20s, "I" am thinking about Derek Hartfield, feeling writing as a terribly painful task and start re-telling the story of the 1970 summer.
Split into simpler sentences: In the last year of my 20s, "I" am thinking about Derek Hartfield. Feeling writing as a terribly painful task, I start re-telling the story of the 1970 summer.