Complex sentence: The Big Trail featuring a young John Wayne in his first starring role is released in both 35mm, and a very early form of 70mm film and was the first large scale big-budget film of the sound era costing over $2 million.
Split into simpler sentences: The Big Trail featuring a young John Wayne in his first starring role is released in both 35mm and a very early form of 70mm film. It was the first large scale big-budget film of the sound era costing over $2 million.