Complex sentence: Stillwater was founded in 2000 as the Fidelity National Property and Casualty Insurance Group, a branch of the Fortune 500 company Fidelity National Financial (FNF), the largest provider of commercial and residential title and mortgage services in the United States.
Split into simpler sentences: Stillwater was founded in 2000 as the Fidelity National Property and Casualty Insurance Group, a division of the Fortune 500 company Fidelity National Financial (FNF). FNF is the largest provider of commercial and residential title and mortgage services in the United States.