Complex sentence: The term megachurch is used for churches with regular attendance of 2,000 people, and when it has more than 10,000 people who gather together, the term "gigachurch" is sometimes used.
Split into simpler sentences: The term megachurch is used for churches with regular attendance of 2,000 people. When it has more than 10,000 people who gather together, the term "gigachurch" is sometimes used.