N4 — outside your level filter
write + and
kaki mashite
and; so — carries a polite clause into the next one, in formal speech and writing
お待たせしまして、申し訳ございません。
o matase shimashite, moushiwake gozaimasen.
I am terribly sorry to have kept you waiting. formal
本日はお忙しい中お集まりいただきまして、ありがとうございます。
honjitsu wa o isogashii naka o atsumari itadakimashite, arigatou gozaimasu.
Thank you for gathering here today in the middle of your busy schedules. formal