Complex sentence: The quarter eagle was struck from 1908 to 1915, and then again in 1925--1929, and the half eagle from 1908 to 1916, and then again in 1929.
Split into simpler sentences: The quarter eagle was struck from 1908 to 1915 and from 1925--1929. The half eagle was struck from 1908 to 1916, and in 1929.