Complex sentence: The presence of the tumor may disrupt the normal contractions of the esophagus on swallowing, leading to nausea and vomiting, regurgitation of food, coughing, and an increased risk of aspiration pneumonia.
Split into simpler sentences: The presence of the tumor may disrupt the normal contractions of the esophagus on swallowing. This can lead to nausea and vomiting, regurgitation of food, coughing, and an increased risk of aspiration pneumonia.