Complex sentence: This deep water test required precise targeting arrays to be set up around the blast location, which presented unique problems for the arrays as the winds, sea currents and tides needed to be within certain limits for the data to be accurate.
Split into simpler sentences: This deep water test required for precise targeting arrays to be set up around the blast location. The open ocean presented unique problem for the arrays as the winds, sea currents and tides needed to be within certain limits for the data to be accurate.