Complex sentence: But in case of a sidereal zodiac (as used in Indian solar calendars) it has no connection with the equinoxes and hence, the length of the Indian solar calendars is longer than the actual tropical solar year.
Split into simpler sentences: But in case of a sidereal zodiac, as used in Indian solar calendars, it has no connection with the equinoxes. Hence, the length of the Indian solar calendars is longer than the actual tropical solar year.