Complex sentence: It should be noted that the visual watch is not permenant, for example, in 2004 the number of hours on watch at NCI Exmouth amounted to 1,536 (there are 8760 hours in a year).
Split into simpler sentences: It should be noted that the NCI's visual watch is not permenant. For example, in 2004 the number of hours on watch at NCI Exmouth amounted to 1,536 (there are 8760 hours in a year).