Complex sentence: Although there is no direct evidence that "Keichosaurus" was ovoviviparous (eggs form and hatch within uterus) due to its simplified elbow joint and the lack of ossification in the olecranon process of the ulna.
Split into simpler sentences: Although there is no direct evidence, "Keichosaurus" was ovoviviparous (eggs form and hatch within uterus). Fossils "Keichousaurus's" display a simplified elbow joint and a lack of ossification in the olecranon process of the ulna.