Complex sentence: Whilst filming, Edgar Rice Burroughs divorced his wife Emma Hubert and married Florence Gilbert, 30-years his junior, on 4 April 1935, after which they escaped to Hawaii for their honeymoon.
Split into simpler sentences: Whilst filming, Edgar Rice Burroughs divorced his wife Emma Hubert. He married Florence, 30-years his junior, on 4 April 1935 after which they escaped to Hawaii for their honeymoon.