Complex sentence: He only receives help from Stuart, a musically inclined Minion who is blissfully unaware of what he has been chosen for; and Bob, a young and inexperienced but infectious Minion who tends to befriend anyone he meets and who is Kevin's only real volunteer.
Split into simpler sentences: He only receives help from Stuart; a musically inclined Minion, blissfully unaware for what he has been chosen. And Bob, a young and inexperienced but infectious Minion who tends to befriend anyone he meets and Kevin's only real volunteer.