covered their ears

"put their hands on their ears." They did this to show that they did not want to hear any more of what Stephen said. (See: rc://en/ta/man/translate/translate-symaction)

They dragged him out of the city

"They seized Stephen and forcefully took him out of the city"

These are cloaks or robes they would wear outside to stay warm, similar in function to a jacket or coat.

"in front of." They were placed there so Saul could watch them.

Saul was probably around 30 years old at the time.