sentence1: Sikhism is a religion that began in India in the mid-15th century with the first guru , known as the Guru Nanak Dev Ji ( 1469-1539 C.E . ) .
sentence2: Sikhism is a religion that began in India in the mid-fifteenth century with the first Guru , known as Guru Nanak Dev Ji ( 1469-1539 C.E . ) .