For four centuries the Protestant Bible in Spanish has been, in effect, one book in successive revisions: Casiodoro de Reina's translation of 1569, as Cipriano de Valera revised it in 1602, and the long line of Reina-Valera editions that followed. The Biblia en Español Sencillo is not one of them. It is a new translation, made in current Spanish and deliberately plain, published by AudioBiblia.org — the New Testament together with Psalms and Proverbs in 2018, the Old Testament finished in October 2019. The translation is credited to Irma Flores, and its publishers describe it as a conservative and evangelical one.
What sets it apart is where it came from. It is the work of an audio-Bible ministry, and the text and a complete chapter-by-chapter recording were produced together rather than one being read out of the other. The stated aim was the same for both: a Bible that is easy to understand, and that can be copied and shared freely and legally. That second half is not incidental. The translation carries a Creative Commons Attribution licence, crediting AudioBiblia.org and Irma Flores, rather than a publisher's reserved rights — which is why the whole text can sit in this corpus and be put verse by verse beside anything else in it.
In this reader it is one of four Spanish editions. Set the interface to Spanish and the reader still opens Reina-Valera 1909; this is an edition you switch to. It also behaves differently in the lineage rungs. Because it is a fresh translation rather than a revision of anything the corpus holds, no parent is recorded for it — so opening a rung beneath a Biblia en Español Sencillo verse takes you straight to the original-language floor marked with ≈, not, as in the English chain, to an older edition of the same book. Put it in the second column against Reina-Valera 1909 instead, and the distance between the two registers is the thing worth looking at.