Complex sentence: Sinkerballers tend to induce a lot of ground ball outs because hitters tend to swing over the ball due to the late downward movement, thus often end up beating the ball into the ground.
Split into simpler sentences: Sinkerballers tend to induce a lot of ground ball outs. This is because hitters tend to swing over the ball due to the late downward movement, and thus, often end up beating the ball into the ground.