Complex sentence: Mainstream Indian cultural elements, especially from Bengali culture, coexist with traditional practices of indigenous people, such as various dances to celebrate religious occasions, weddings and festivities; the worship of regional deities; and the use of locally-crafted musical instruments.
Split into simpler sentences: Mainstream Indian cultural elements, especially from Bengali culture, coexist with traditional tribal practices. Notable features of tribal culture include various dances to celebrate religious occasions, weddings and festivities; the worship of regional deities; and the use of indigenous musical instruments.