Complex sentence: Megatron often relied on Tarantulas because of his technological and strategic brilliance, but was always suspicious of his intentions and aspirations as well as his somewhat psychotic nature (he made comments about Tarantulas' "treachery" long before he ever found about his agenda).
Split into simpler sentences: Megatron often relied on Tarantulas because of his technological and strategic brilliance. However, he was always suspicious of his intentions and aspirations as well as his somewhat psychotic nature (he made comments about Tarantulas' "treachery" long before he ever found about his agenda).