Complex sentence: The series was begun in 1995, and as of February 2017, there are over 510 titles in the series, which has been very commercially successful, and have been published in more than 25 languages.
Split into simpler sentences: The series was begun in 1995, and in February 2017 there were over 510 titles. The books have been commercially successful, and have been published in more than 25 languages.