Original sentence: Additional research suggests that at least some of these horses' forebears were part of the South African cavalry which had set up camp in the Namib where some horses escaped, frightened by shots fired from a low flying German airplane during World War I.Another theory says that a ship with horses on board was run aground; the strongest horses were able to swim ashore to the mouth of the Orange River and up to the Garub Plains, where the modern herds live today.It is thought the horses developed into a distinctive breed with the addition of German bloodlines.There are several theories on how the Namib Desert Horse originated:  The first horses in sub-Saharan Africa were brought by the Dutch to the area of the Cape of Good Hope in the 17th century
Edited sentence: A study released in 2005 suggests two likely source of these horses' forebears.In addition, during World War I, at one point, the South African military was advancing against the Schutztruppe, then located in the Namib near Aus, when the pilot of a German biplane dropped bombs onto the South African camp near Garub.In the process, some ordinance landed among a herd of 1,700 grazing horses.In this period, Kreplin bred both work horses and race horses.Others suggest  that some of these horses' forebears escaped from the South African cavalry during World War I.Photo albums from the stud show animals with distinctive characteristics still seen in the Namib Desert Horse of today.The first horses in sub-Saharan Africa were brought by the Dutch to the area of the Cape of Good Hope in the 17th century.The first source was a stud farm near Kubub, owned by Emil Kreplin, once mayor of Lüderitz from 1909 to 1914.There are several theories on how the Namib Desert Horse originated:   One theory says that a ship with horses on board was run aground; the strongest horses were able to swim ashore to the mouth of the Orange River and up to the Garub Plains, where the modern herds live today.These escaped army animals may have joined stock animals lost from Kubub in the turmoil of the war at various watering places in the Aus Mountains and  Garub