Original sentence: Arthropleura (one male).Cheetah (one, male).Egrets (about twenty, males and females).Macaw (one, gender unkown).Meganeura (one male).Ornithomimus velox - a dinosaur somewhat like a modern ostrich (at least 13, males and females, later they had 8 chicks, one chick may be named Ollie).Phorusrhacos (one male).Pulmonoscorpius (one, gender unknown).Sacred Ibis (about six, males and females).Smilodon populator (one male and one female, who later had two cubs, the female may be named Sabrina).Triceratops horridus - a three-horned dinosaur (one male, named Theo)
Edited sentence: Cheetah (one, male) (Nigel's Pet_.Egrets (about twenty, males and females) (Nigel's Pet).Giant Millipede (one male).Giant Scorpion (one, gender unknown).Giant Sragonfly (one male).Macaw (one, gender unkown)  (Nigel's Pet).Ornithomimus - a dinosaur somewhat like a modern ostrich (at least 13, males and females, later they had 8 chicks, one chick may be named Ollie).Sabre-tooth Cat (one male and one female, who later had two cubs, the female may be named Sabrina).Sacred Ibis (about six, males and females) (Nigel's Pet).Terror Bird (one male).Triceratops - a three-horned dinosaur (one male, named Theo)