Complex sentence: RMS "Strathmore" was an ocean liner of the Peninsular and Oriental Steam Navigation Company (P&O), the third of five sister ships built for P&O in the "Strath" class.
Split into simpler sentences: RMS "Strathmore" was an ocean liner of the Peninsular and Oriental Steam Navigation Company (P&O). She was the third of five sister ships in the "Strath" class.