Complex sentence: The two fell in love, were married in 1971, then two years later Donna gave birth to Evie, shortly after which, in 1974, Troy was called back to Antareus to fight in a war.
Split into simpler sentences: The two fell in love, were married in 1971, and two years later Donna gave birth to Evie. Shortly after, in 1974, Troy was called back to Antareus to fight in a war.