Complex sentence: Tadoba National Park formed in 1955 is one of the oldest national parks but it is only in 1993 that its merger with Andhari wildlife sanctuary led to the creation of Tadobo Andhari Tiger Reserve.
Split into simpler sentences: Tadoba National Park, formed in 1955, is one of the oldest national parks. In 1993 its merge with Andhari Wildlife Sanctuary led to the creation of Tadobo Andhari Tiger Reserve.