Complex sentence: Sofia Zoo's exhibition of animals constantly increased, with both local and foreign species being added, notably a pair of lions in 1892, which were housed in a former stable and had a lion cub the same year.
Split into simpler sentences: Sofia Zoo's exhibition of animals constantly increased, with both local and foreign species being added. Most notably a pair of lions in 1892, which were housed in a former stable and a lion cub was born the same year.