Complex sentence: Tony later explains that the strain of being Iron Man finally took its toll on their relationship; the Sokovia Accords would be a blessing, since it's strongly implied Pepper would consider Tony more responsible if he were acting in less of a vigilante role.
Split into simpler sentences: Tony later explains that the strain of being Iron Man finally took its toll on their relationship. The Sokovia Accords would be a blessing, since it's strongly implied Pepper would consider Tony more responsible if he were acting in less of a vigilante role.