My Office Word programme says that a comma is required in both the following sentences where included (according to Word, these use introductory 'sentences'). However, as English learners, we are unsure in our group whether it is neccessary in each of these sentences.
(1) For the first two years of doing business, we generated our income through a commission we charge on every order.
(2) With the extension towards more business partners, we estimate dramatically raising costs as well as turnovers.
We appreciate your help. Thank you in advance.
Greetings from Germany.