Complex sentence: Martinez is the right-hand man of Magbuela, who-according to book reviewer Vicente G. Groyon III, is is the least remarkable yet the most memorable character in "My Sad Republic".
Split into simpler sentences: Martinez is the right-hand man of Magbuela. According to book reviewer Vicente G. Groyon III, Martinez is the least remarkable yet the most memorable character in Gamalinda's "My Sad Republic".