The arteries of the neck or the function of the heart may be producing a small blood clot that is the main culprit (embolic stroke).
(The arteries of the neck or the function of the heart; may be producing; a small blood clot that is the main culprit (embolic stroke)) (a small blood clot; is; the main culprit)
The arteries of the neck or the function of the heart a small blood clot
may be producing is
a small blood clot that is the main culprit (embolic stroke)
the main culprit