Complex sentence: Inc. launched SubscriberMail, which specializes in email marketing and owns a patent (US Patent-6,769,002) on its web-based, multi-level channel email marketing process.
Split into simpler sentences: Inc. launched SubscriberMail, which specializes in email marketing. He owns a patent (US Patent-6,769,002) on its web-based, multi-level channel email marketing process.