Complex sentence: The vehicle has an angular design similar to Tatra T6A5 and Tatra KT4 both outside and inside, during its production period, several versions of KT8D5 were sold.
Split into simpler sentences: The vehicle has an angular design similar to Tatra T6A5 and Tatra KT4 both outside and inside. During its production period, several versions of KT8D5 were sold.