Complex sentence: The membership raised the necessary funds during the first phase of the campaign.In the summer of 2010 Jack and Jill of America donated to the Windy City Habitat for Humanity, becoming a partial house sponsor.
Split into simpler sentences: The membership raised the necessary funds during the first phase of the campaign. Summer of 2010 Jack and Jill of America donated to the Windy City Habitat for Humanity and Jack and Jill became a partial house sponsor.