Complex sentence: Though he offers Kouta a place in his group, Sonomura reveals a Mango Lockseed Sid gave and he uses it to summon the Lion Inves until the Lockseed shorts out, nearly getting himself killed by the masterless Lion Inves.
Split into simpler sentences: Though he offers Kouta a place in his group, Sonomura reveals a Mango Lockseed Sid gave him. He uses it to summon the Lion Inves until the Lockseed shorts out, nearly getting himself killed by the masterless Lion Inves.