Complex sentence: Dorit Rubenstein Reiss' passion for immunisation advocacy started in 2010, with the birth of her son.At the time, there had been stories on the news about a whooping cough epidemic, which prompted Reiss to seek advice from her doctor on how to protect her child.
Split into simpler sentences: Dorit Rubenstein Reiss' passion for immunisation advocacy started in 2010, with the birth of her son. In that year, there had been stories on the news about a whooping cough epidemic, which prompted Reiss to seek advice from her doctor on how to protect her child.