Complex sentence: Inside, there were very few changes except all models now featured reclining front seats (excluding the bench seats) this had been previously an option on the 190c and 190Dc, and the 230 had a central armrest in the back seat as standard.
Split into simpler sentences: Inside, there were very few changes except all models now featured reclining front seats (excluding the bench seats), which had previously been an option on the 190c and 190Dc. The 230 had a central armrest in the back seat as standard.