Complex sentence: Daniel is then shown to be self-harming with a small knife, while during his walk, Ken uncovers Denise's belongings buried in the garden, and becomes convinced that Daniel has murdered Denise.
Split into simpler sentences: Daniel is then shown to be self-harming with a small knife. During his walk, Ken uncovers Denise's belongings buried in the garden, and becomes convinced that Daniel has murdered Denise.