Complex sentence: In 1967, Murphy was reinterred at the old Man o'War burial site but with the building of the Kentucky Horse Park, his remains were moved again to be buried next to Man o' War at the Kentucky Horse Park's entrance.
Split into simpler sentences: In 1967, Murphy was interred at the old Man o'War burial site. But with the building of the Kentucky Horse Park, his remains were moved again to be buried next to Man o' War at the Kentucky Horse Park's entrance.