Complex sentence: Later on, the two paired after Shion and Mokuren got engaged; however, Gyokuran still loved Mokuren and believed that Shion forced her into the engagement, allowing him to hope that Mokuren did love him back.
Split into simpler sentences: Later on, the two paired up after Shion and Mokuren got engaged. However, Gyokuran still loved Mokuren and believed that Shion forced her into the engagement, allowing him the hope that perhaps Mokuren did love him back.