Complex sentence: This aircraft project, while interesting, wasn't considered as a serious alternative to the Re.2006, but perhaps led to the proposed Re.2007, a jet project capable of performances similar to the F-86 Sabre.
Split into simpler sentences: This aircraft project, while interesting, wasn't considered as a serious alternative to the Re.2006. Often mentioned is the proposed Re.2007, a jet project capable of performances similar to the F-86 Sabre.