Complex sentence: In later years, various proposals were put forward to salvage "Titanic" but all fell foul of practical and technological difficulties, a lack of funding and in many cases a lack of understanding of the physical conditions at the wreck site.
Split into simpler sentences: In later years, various proposals were put forward to salvage "Titanic". However, all fell foul due to practical and technological difficulties, a lack of funding and, in many cases, a lack of understanding of the physical conditions at the wreck site.