Complex sentence: Captain America's uniform was altered from the ones seen in previous films, with a Kevlar-based ballistic component that would protect Captain America but at the same time function like a military uniform.
Split into simpler sentences: Captain America's uniform was altered from the ones seen in previous films. The suit was given a more real world look with a Kevlar-based ballistic component that would protect Captain America but at the same time function like a military uniform.