Complex sentence: There is also a thriving light manufacturing sector centred on the industrial zone to the west of the town, where the presence of significant retail developments testifies to Haguenau's importance as a regional commercial centre.
Split into simpler sentences: There is also a thriving light manufacturing sector centred on the industrial zone to the west of the town. Here the presence nearby of significant retail developments testifies to Haguenau's importance as a regional commercial centre.