Complex sentence: At first a number of leading Esperantists put their support behind the Ido project, but the movement descended into fragmentation and decline as people proposed further changes, and the number of current speakers is estimated at between 250 and 5000.
Split into simpler sentences: At first a number of leading Esperantists put their support behind the Ido project, but the movement descended into fragmentation and decline as people proposed further changes. The number of current Ido speakers is estimated at between 250 and 5000.