Forest management generally simplifies forest structure and composition with some negative impacts in terms of biodiversity and resilience. Thus, maintaining structural complexity is increasingly cited as an objective of sustainable forest management. Different initiatives have been proposed to use partial cuts to increase the complexity of forests. Using “the length of description” of forest patterns as a novel measure of complexity in forests, the effects of two intensities of partial cuts were compared to those found in 34-year-old secondary forests and 86-year-old primary (post-fire) forests. Our results show that partial cuts increase the complexity of forest patterns as compared to mature and secondary forests.