Complex sentence: The 88mm was used in two main roles: as a mobile heavy anti-aircraft and anti-tank gun, in support of the troops at the front; and as a more static anti-aircraft gun for home defence.
Split into simpler sentences: The 88mm was used in two main roles: as a mobile heavy anti-aircraft and anti-tank gun. Other uses included firing in support of the troops at the front; and as a more static anti-aircraft gun for home defence.