Complex sentence: Some styles of mats may feature small, flexible spikes on their underside to grip carpeting underneath better, and many makeshift vehicle mats are becoming more popular, often taking the form of PVC alternatives, but rubber vehicle mats are still seen as the safest option.
Split into simpler sentences: Some styles of mats may feature small, flexible spikes on their underside to grip carpeting underneath better. Many makeshift vehicle mats are also becoming more popular, often taking the form of PVC alternatives, but rubber vehicle mats are still seen as the safest option.