If Sheila Hale's massive biography of Titian seems to much, you will find Bruce Cole's smaller & more tightly focussed Titian & Venetian Painting 1450-1590 (1999) an easier read. Cole focussed much more on the painting & deploys some good sources to explore Titian's career, method & influence. Full of concise insights this is good mainstream art history, ideal if you're interested in Titian & want a quick introduction.