Complex sentence: A series of international crises strained the League to its limits, the earliest being the invasion of Manchuria by Japan and the Abyssinian crisis of 1935/36, in which Italy invaded Abyssinia, one of the only free African nations at that time.
Split into simpler sentences: A series of international crises strained the League to its limits. The earliest being the invasion of Manchuria by Japan and the Abyssinian crisis of 1935/36 in which Italy invaded Abyssinia, one of the only free African nations at that time.