1 Spice Girls were on Top of the World
The Spice Girls created astounding music and gained full recognition worldwide. The band featured five powerful women, including Geri Halliwell, Victoria Beckham, Melanie Brown, Emma Bunton, and Melanie Chisholm.
The first single 'Wannabe' was a massive hit when released in 1994, and these girls almost ruled the entire music industry for the next two years till 1996 by releasing hits including Spice Up Your Life, Say You'll Be There, Too Much, and many more. (See Why Taylor Swift is so popular?)
2 To peruse solo careers
Some people quoted that the separation was inescapable. The lead artist and most renowned singer of the band, Geri Halliwell's success was one of the primary reasons for this band to split up. The other girls wanted to duplicate the success as that like Halliwell as they wanted to experience personal growth and fame. The same happened with famous bands like the Eagles, Supremes, and the Beatles.
It not only happened with this band, as this is a common phenomenon that happens with most of the bands when one artist gets more fame than others in the group; the others envy the lead artist who becomes a reason for the separation. It also motivated other artists to go solo. They think that splitting up would help them grab an opportunity to perform solo, showcase their talent uniquely and exquisitely, and try different musical styles.
3 Differences with Halliwell
In 1998, Halliwell (the most prominent singer) left the band abruptly. They all were on an American tour, and she just left without even notifying anyone in the group. Her sudden exit from the group became a subject of speculation at that time. However, it is still unclear why she left the group; her exit was the biggest reason for the band to break up.
The remaining four members tried to carry on without Geri, but they could not keep up the way their group was. In 2000, they released an album 'Forever,' which was their last one, and they announced that they all were going to focus on individual careers in the industry. (See Why is Lady Gaga so famous?)