Complex sentence: Vincent is a hitman who has apparently been working for mob boss Marsellus Wallace (Ving Rhames) in Amsterdam for over three years and recently returned to Los Angeles, where he has been partnered with Jules Winnfield (Samuel L. Jackson).
Split into simpler sentences: Vincent is a hitman who has apparently been working for mob boss Marsellus Wallace (Ving Rhames) for at least two years. He has been working in Amsterdam and recently returned to Los Angeles, where he has been partnered with Jules Winnfield (Samuel L. Jackson).