Complex sentence: There are also trials with genetically modified male "A. aegypti" that after release into the wild mate with females, and their offspring live through the larval stage but die as pupae, before reaching sexual maturity.
Split into simpler sentences: There are also trials with genetically modified male Aeguis Aegypti which are released into the wild. When females mate with the GM male mosquitoes, their offspring live through the larval stage but die as pupae, before reaching sexual maturity.