iphoto library not intact - somehow change to multiple folders
I travel the world on many different research expeditions and many photos. When I started I stored photos in iPhoto and originally could add descriptive "sidecar" information. iPhoto changed and lost my sidecar data. Because iPhoto/now Photos can only effectively manage relatively smaller libraries I opted to create new library folders and named them. So using iPhoto manager I could select which library I could view.
The problem is that some of those iphoto libraries changed to multiple folders containing I don't know what. They cannot be opened. Does anyone know what I need to do to reassemble those libraries so I can move them into a larger photo manager program?
Thanks in advance@
MacBook Pro 14″, macOS 14.6