@JohnDamian has it right.
This was basically an internal struggle within the Franciscan order (which, at the time, had not yet separated out into the Order of Friars Minor, OFM Conventuals and OFM Capuchins).
Francis stressed the poverty of Jesus, particularly at his birth — being born in a stable — and his death — dying naked on a cross. He therefore tried to live a life of complete poverty and put this in his Rule for his followers, the Franciscans. In the century after Francis’s death, however, the necessities of ministry (much less for things like caring for elderly and ill friars) had pushed the main part of the order into having houses and attached gardens. Some friars, however, particularly those living in hermitages, decried this as a violation of the Rule, saying that Jesus had been poor throughout his life. This caused internal dissent within the order.
Different popes tried to deal with this conflict in different ways. Some were more sympathetic to the reformers, generally referred to as the “Spiritual Franciscans” (and, later, as the Fraticelli); others to the main part of the order. But, regardless, the internal struggle continued.
John XXII decided to stop this thing once and for all. In November 1323, in his papal bull Cum inter nonnullos, he ruled that Jesus had possessions and made it an article of faith. He then unleashed the recently-created inquisition on the Spirituals. (In fact, the inquisitor — Michael Le Moine — was himself a Franciscan, meaning this was very much an internal conflict within the order but that external means were being used to quell it.) As a result of the inquiries of the inquisition, some Spirituals recanted and many others were burned at the stake for the crime of heresy.
This effective muted the Spirituals, but not the need for reform. A later reform group was given the green light and became what is now the OFM (breaking from what is now the Conventual Franciscans). A later reform group (coming mainly from the Conventuals but drawing from both the OFM and the Conventuals) were the Capuchin Franciscans.
To investigate this further, you can read David Burr’s book The Spiritual Franciscans: From Protest to Persecution in the Century After Saint Francis available at Amazon and at many libraries.
This gradual accumulation of wealth followed by a call for reform is a constant thread in the 800-year-old history of the Franciscan order.