Complex sentence: Viruses with diverse sequences can be found within the same geographic area; closely related viruses have been isolated from widely separated regions, suggesting that viral dispersion has occurred possibly by ticks carried on migratory birds or through international livestock trade.
Split into simpler sentences: Viruses with diverse sequences can be found within the same geographic area; closely related viruses have been isolated from widely separated regions. This suggests that viral dispersion has occurred possibly by ticks carried on migratory birds or through the international livestock trade.