Complex sentence: This means that, although it is possible to use lenses made for the 35mm format on APS-C cameras, lenses designed for 35mm may lack sufficient resolution to get the best from smaller formats.
Split into simpler sentences: This means that, although it is possible to use lenses made for the 35mm format on APS-C cameras. However, lenses designed for 35mm may lack sufficient resolution to get the best from smaller formats.