Complex sentence: Through their books and their sermons, speeches and lectures presented on invitation at Bible Schools and Christian business congresses, they stirred up a Pentecostal Christian revival in seven countries and their books were circulated in approximately 150 countries and islands.
Split into simpler sentences: Through their books and their sermons, speeches and lectures presented on invitation at Bible Schools and Christian business congresses, they stirred up a Pentecostal Christian revival in seven countries. Their books were circulated in approximately 150 countries and islands.