Complex sentence: A goitre or goiter (Latin "gutteria", "struma"), is a swelling of the neck or larynx resulting from enlargement of the thyroid gland (thyromegaly), associated with a thyroid gland that is functioning properly or not.
Split into simpler sentences: A goitre or goiter (Latin "gutteria", "struma"), is an enlargement of the thyroid gland, which can lead to a swelling of the neck or larynx (voice box). Goitre is a term that refers to an enlargement of the thyroid (thyromegaly) and can be associated with a thyroid gland that is functioning properly or not.