Complex sentence: The world's heart-beat quickened when the first submarine cable linking Ireland/Europe to USA/Newfoundland in 1858 it is true it did not last long but from that point there was never any doubt that it was feasible.
Split into simpler sentences: The world's heart-beat quickened when the first submarine cable linked Ireland/Europe to USA/Newfoundland in 1858. It is true it did not last long but from that point there was never any doubt that it was feasible.