Complex sentence: Teak is chosen because of its natural waterproofing properties--it has been used for hundreds of years in the marine industry for this reason teak also has natural antiseptic properties, which is a bonus for its use in baths and sinks.
Split into simpler sentences: Teak is chosen because of its natural waterproofing properties--it has been used for hundreds of years in the marine industry for this reason. Teak also has natural antiseptic properties, which is a bonus for its use in baths and sinks.