Complex sentence: Luisa was given praise for her prior successes in business, but concerns were raised on her immaturity and unprofessional behaviour, which were prevalent throughout her interviews, while her business plan was also felt to be poorly written up.
Split into simpler sentences: Luisa was given praise for her prior successes in business, but the concerns for immaturity and unprofessionalism were prevalent throughout her interviews. Her business plan was also felt to be poorly written up.