Complex sentence: The Type XXIs had much better facilities than previous classes, with a freezer for foodstuffs and minor conveniences for the crew such as a shower and wash basin--crews on other boats spent weeks-long patrols without bathing or shaving.
Split into simpler sentences: The Type XXIs had better facilities than previous classes, including a freezer for foodstuffs. Conveniences for the crew included a shower and wash basin--crews on other boats spent weeks-long patrols without bathing or shaving.