Complex sentence: In 1921, the part time Hagana was formed, trained as a national army, it was equipped with numerous weapons left over from the Second World War and most Jewish males and some females were required to join.
Split into simpler sentences: In 1921, the part time Hagana was formed and trained as a national army. It was equipped with numerous weapons left over from the Second World War and most Jewish males and some females were required to join.