Complex sentence: On May 16,1992, Sánchez was being transported in the early morning hours through the streets of the Sinaloa, Mexico capital city of Culiacán when a supposed unmarked federal police vehicle forced their Chevy Suburban to stop in a secluded area.
Split into simpler sentences: On May 16,1992, Sánchez was being transported in the early morning hours through the streets of the Sinaloa, Mexico capital city of Culiacán. An unmarked vehicle, possibly with federal police inside, forced the Chevy Suburban to stop in a secluded area.