Complex sentence: Companies may hold no more than two offices (eg, companies reaching 15 to 20 people outgrow Catapult) and are not permitted to stay at Catapult for more than 18 months.
Split into simpler sentences: Companies may hold no more than two offices. Companies reaching 15 to 20 people outgrow Catapult and are not permitted to stay at Catapult for more than 18 months.