Complex sentence: Upwardly Global was started by Jane Leu in 1999, who, having worked extensively with immigrants, asylees, and refugees, saw what she perceived as a need for services for educated, experienced immigrants.
Split into simpler sentences: Upwardly Global was started by Jane Leu in 1999. After having worked extensively with immigrants, asylees, and refugees, Jane perceived a need for programs aiming to serve educated, experienced immigrants.